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I have a build with a Ryzen 9 5900x, a Radeon rx7900xtx 64gb gskill 3600 32x2 liquid cooled An asus proart creator b550 and a 1000w psu im running win 10 pro i have replaced the ram, and mobo. ive turned up the voltage on the processor still crashes, I’ve turned the voltage down still crashes, disabled xmp/docp, updated bios, on both boards one am msi gaming board and one the proart that I am using, I have turned the voltage up and down on the ram and still crashes. All the temps are fine. The last two things I can think of are rma the processor or upgrade the psu. Any insight would be much appreciated. Also event viewer says Kernal power for the crash.

I have built a new pc last October. Here are the specs: ASRock x670e pro rs Ryzen 9 7900X Corsair VENGEANCE DDR5 RAM 64GB (2x32GB) 6000MHz CL40 Corsair RM1000e GTX 1080ti (my old card,will upgrade eventually) I am encountering the following issue about every time I start my PC and every time I reboot. When I press the power button everything inside the case lights up and fans start spinning, but the CPU and RAM LEDs light up and stay on. There is no power to the peripherals and no output to the display. This state does not change even after waiting for 30 or more minutes. The only thing that I can do to get it to boot is power cycling it (switch off PSU and hold power button for about 30 to 40 seconds) After doing that and switching the PSU back on, the same problem occurs. But after then shutting it down by holding the power button and then powering it on again it all turns on normally and everything works (all of the RAM is detected, CPU works well under heavy loads, no crashes etc.) This fix works most times, but sometimes nothing helps for like 30 minutes trying or more and suddenly it starts. I have tried about everything: - clearing CMOS - updating BIOS - replugging all cables - reseating CPU (multiple times) - reseating RAM (multiple times) - enabling/disabling XMP Do you have any ideas what could cause this? RMA of the motherboard or the PSU are my last resort because I need my PC every day for work and university.

So I’m upgrading my older pc I upgraded ram (worked fine), power supply (worked fine), cpu (not so much). I put in new cpu and the white debug light keeps coming on. I really don’t know what to do… will not boot. Specs B450M BAZOOKA MAX WIFI 32 GB ddr4 ram 850w redragon power suppl ryzen 9 5900x 500 GB ssd

Hello, I've just built my first pc, and am taking note of the temperatures I am getting and trying to get a read if my temperatures are normal. Specs are as follows: Ryzen 9 7900x Kraken Elite z73 360mm AIO set to exhaust. G Skill 64gb cl30 5800mhz Asus B650E-F Gaming Wifi Xfx 7900xt black MSI A1000g 1000w power supply 3 lian li sl120 fans set to intake Noctua Redux 120mm set to exhaust ------------------------------------------------------------------------- CPU temps Idle at 38-40 degrees with a few chrome tabs and nzxt cam open to monitor Sits at 58-65 Playing Minecraft, RUST, TF2 , etc with GPU at 48 degrees. CPU hits 91 degrees and clocks at 5.1 GHZ under 100% load using Cinebench R23 Motherboard settings are mostly stock, any recomendations or confirmations about what I am seeing would be beautiful, Thank you so much.

AMD has a slower speed for their RAM when 4 DIMMS are installed and faster when only 2 DIMMS are installed. Would it theoretically be possible to disable 2 DIMMS dynamically (While the system is running and booted into OS.) when less RAM is being used and enable the other 2 DIMMS when massive amounts of RAM are required by the system? Thereby getting the benefits of a ton of RAM or fast clock speeds. This is without removing the DIMM modules manually each time since that could be tedious, error prone, and potentially destructive if you're unlucky.

Before anything, I'm Brazilian and I work with 3d rendering so I was looking for a powerful pc mainly to work with, and that could also handle games. I built up a PC (it's my first time) and bought a ryzen9 3900x and an RTX2060super, but since I don't understand about power supplies, I bought the cheapest 80plus 600w PSU that I found. When the PC arrived, the PSU was making an unpleasant noise that only got worse when the CPU worked harder. I activated the warranty and sent the PSU, now I'll have to wait like 2 months until they give me a response about the PSU problem, send back and finally arrive at my house. And now the problem is, I need to work but the only PSU I have left is a non80plus 550w, and I'm afraid of burning my PC down. My PC: CPU: 3900x with stock cooler MB: x470gtn (https://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=910) GPU: rtx2060super mini (https://www.zotac.com/pt/product/graphics_card/zotac-gaming-geforce-rtx-2060-super-mini) RAM: 2x 8gb 3200mhz SSD: evo 850 500gb Gabinet: mini-tower with 4 fans cheap 600w 80plus: https://www.terabyteshop.com.br/produto/12395/fonte-cougar-vtc-600-80-plus-600w-pfc-ativo-31vc060004p01?gclid=CjwKCAiA1L_xBRA2EiwAgcLKA5dWWRWC1KhXgotUL8hR9UTaL4Iwz78jqunLHnIkKhkQVVUbumTYgBoC0bMQAvD_BwE 550w non80plus I have left with 2 years of use: https://www.pichau.com.br/fonte-cooler-master-elite-v2-550w-rs550-pcarn1-br-box The main question is, my 600w psu will be suficient for my PC? If yes, can I use the 550w while I wait it to arrive?? And if not, what PSU do you guys recommend me to buy right now?

Game Specific (Assetto Corsa):

Budget (including currency): 3.5K-3.7k USD Country: USA Games, programs or workloads that it will be used for: Valorant, Fortnite, Spiderman, Cyberpunk, God of War, etc Other details (existing parts lists, whether any peripherals are needed, what you're upgrading from, when you're going to buy, what resolution and refresh rate you want to play at, etc): Will this parts list be good enough for me to be able to play games at 1440p and 240hz? If not what should I change in order to be able to do so at the desired 1440p and refresh rate? I've been doing some research, but I'm still unsure. Please help. Anything I could swap something out with for better speed, while still being withing budget is welcomed . CPU AMD Ryzen 9 7900X 4.7 GHz 12-Core Processor CPU Cooler Corsair iCUE H150i ELITE LCD XT 65.57 CFM Liquid CPU Cooler Motherboard Gigabyte B650 AORUS PRO AX ATX AM5 Motherboard Memory Corsair Vengeance RGB 64 GB (2 x 32 GB) DDR5-6000 CL40 Memory Storage Samsung 980 Pro 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive Video Card Asus ROG STRIX GAMING OC GeForce RTX 4090 24 GB Video Card Case Lian Li O11 Dynamic EVO ATX Mid Tower Case Power Supply Corsair RM1000x (2021) 1000 W 80+ Gold Certified Fully Modular ATX Power Supply Monitor Innocn 27G1S 1440p 240hz

Upgraded from a 3900X to a 5900X tonight. Upon starting my pc after install, it immediately goes to BSOD Machine Check Exception, then to WHEA Uncorrectable Error. Tried without XMP, right into WHEA. I've reseated my CPU twice, booted into Windows for about 30 seconds and then it BSODed again after logging in. Currently just boot looping into a BSOD. Aggressively Googled this and nothing I can find works. I'm on the most current stable BIOS release. I've cleared CMOS. CPU idling at 41⁰C according to BIOS. I can't get into the OS so I can't get dumpfiles. Booting into safe mode doesn't work at all. Is my new CPU defective? Any help at all is much appreciated and much needed. I really have no clue what to do.

Hello all, I am at a standstill regarding this. It all started due to an error I get playing Warzone but noticed my CPU temps were very high. Based on research I see that the Ryzen 5950x shouldn't go past 90 degree under load. However, I noticed that even doing basic things like browsing the internet It's in the upper 80 degree mark. My current setup is as followed: MB: ASUS X570-E Gaming BIOS Version 4602 (03/14/2023) All settings in BIOS is left to default. CPU: AMD Ryzen 9 5950X Cooling: LianLi Galahand 360 AIO RAM: G. Skill 3600 64 GB (2x32 GB) GPU: NVIDIA GeForce RTX 3080 OS: Windows 11 22H2 [22621.1778] PSU: Seasonic FOCUS GW-850 850W 80+ Gold Here is my computer's temperature results just browsing and re-downloading applications after a fresh reinstall of Windows 11. Things I've done: Complete reinstall of Windows 11 Updated BIOS Cleaned out any dust in PC case Reapplied thermal paste Redid wiring of fans. Check the fans are all working. I can see, through HWMonitor, that my pump RPM is at the desired 3300 RPM so I'm assuming the pump is working. Please any help would be appreciated. I'm just running out of ideas.

Budget (including currency): USD $1000-$1500 Country: USA Games, programs or workloads that it will be used for: Games, Adobe, Unreal 5 Other details (existing parts lists, whether any peripherals are needed, what you're upgrading from, when you're going to buy, what resolution and refresh rate you want to play at, etc): Current PC https://pcpartpicker.com/user/HybridRain/saved/shv74D Debating if I should buy a new motherboard and processor. Maybe later upgrade everything to avoid bottlenecks. If you had the chance, what would you prefer to do? This processor has been solid and got no complaints, but I might have to sell my PC due to moving soon. I want your opinions! Thanks!

My Guess Is Power Issues With His GPU Other Than That Idk, He Does Have A Underpowered PSU For His System That Caused His Pc To Trip O.C Protection When Playing Certain Games (Which He's Going To Replace soon(tm), His Spec's Are, CPU: Ryzen9 5900x, GPU: RTX 3070 8Gb, Motherboard: MSI MAG B550 Tomahawk, RAM: Corsair Vengeance LPX 32GB (2 X 16GB) DDR4 3200 (PC4-25600) C16

I’ve committed the sin to make this my first build. Continued BSOD with the current system: motherboard Msi MAGx570 tomahawks Wi-Fi, cpu ryzen9 3950, gpu zotac RTX 3090, RAM Corsair vengeance lpx 32*2, PSU Corsair RM850 gold, SSD M.2 Samsung 980 PRO 1tb, Samsung 860 evo 1tb sata 2.5. Tried to fix it for the past 4 months and everything seems to point at the motherboard. I’ve decided to return it. Loads of other people seem to have the very same issue with AMD ryzen 9 processors and x570 motherboards. Can anyone with a similar built recommend me anything? What shall I do? Budget max for the motherboard 400£, recommendations welcome Many thanks

Hey guys, i am new here and this is my first post, so please bear with me plz :). I have the following setup: The problem is when i setup DOCP i get random results. sometimes the computer beeps and turns on into bios safe mode sometimes it boots just fine and windows is stable, I ran AIDA64 stability test for 8 hours and nothing crashed, problems happen only on boot up, once it boots not issues at all. I also believe i have a good cpu chip, the 5 way optimization gave me +34% performance increase to 4.5 GHz at 1.283 volts. Any idea what should i do to get the system stable? P.s: when i set DOCP i get fabric speed at 1800, should it be 2000? Thanks guys

I hear there's an AMD/NVIDIA bottleneck, but I really love the Ryzen series so I went with that over Intel anyways. Will I notice the bottleneck at all? I'm fairly certain looking at a few benchmarks, videos, etc. that I probably wont have any trouble running anything I want at max settings and get over 60fps (most of the time well over 100 as well). Should I have gone with something else?

GPU - 2070 Super CPU - Ryzen 9 5900x RAM - 16gb Corsair 3600mhz PSU- Corsair 850w MOBO - Asus Tuf X570 Cooling - NZXT x73 (7 fans, front radiator) Recently gotten this new cpu and am looking for a good Clock speed for high end gaming. I know the Max for the cpu is 4.7mhz, but not sure what the longevity would be for using that speed, as would at least want to make the cpu last a couple of years. Any ideas for a good voltage paired with like a clock speed above at least 4.5mhz.

Hey Guys i recently assembled the below system : 5900x Asus b550f Mobo Corsair 16gb*2 @3600mhz(XMP) CL18 Kraken X63 AIO RTX 3080FE Corsair RM750x PSU Lian Li 215 Case my cpu in ryzen master always shows voltage fluctuating between 1.39V to 1.46V, My temps fluctuate between 46 to 51 Deg Celsius and my clock speed from 1ghz to 3.6ghz. i don't know if this is normal or what can i do to avoid such massive fluctuation. can someone please help me understand this and guide me what i should do ? i come from an intel 6700K and have no experience of overclocking. appreciate some help on this.

Hello everyone, i have a friend that has a Ryzen 9 5900X running 4,5mhz and 1,4v average. She uses Maya, Zbrush, plays Overwatch, Battlefield and some other demanding games but when it comes to try new or beta games her pc suddenly restarts (Games like ''The Cycle: Frontier'', ''Century: Ashes of Ages'' and ''Chivalry 2''). We saw that she has some ''Kernel-power'' issues but we don't know if it's a Power supply, Cpu, Gpu or Ram problem because the Cpu and Gpu don't go further than 68-70°C(158°F) even on stress tests. Hope someone can help us to figure out what's the issue. Specs: G750M cooler master 750w 80 PLUS Bronze power supply MSI Rtx 2060 Super 8gb Ryzen 9 5900X ASRock B450M Steel Legend Water Cooling 16Gb(2x8) Ram 3600Mhz

Hello there! This is my review for the AMD Ryzen 9 5900X. I have had this processor since Christmas, and I think it now deserves a review. THE PROS A lot. Great temps, (probably because of my 360mm AIO) great speeds, tons of cores, and overall just a great processor. I only do medium gaming on it and light photoshop/video editing work, but it works like a dream. The processor hits like 50-60C while under load. The 12 cores can handle anything, and got me a 20,000+ score on Cinebench R23. I love this processor. But, just one small tweak can make this a 10/10. THE CONS What I want to be implemented, is a 1st party temperature checker. I know that Ryzen Master exists, I have that, but what I mean is one built right into the chipset OS. It will save like 5-15 minutes of setting up Ryzen Master. CONCLUSION This processor, is an absolute masterpiece. The temperatures aren’t Ryzen under load. (Get it?) Anyways, I love this processor so much. AMD Ryzen 9 5900X Review Score: 9.5/10. Just that small thing, and its a 10.

I'm having a weird issue with my new 5900x where it will go from being fast and responsive, then all of a sudden it will take like 15+ seconds just to open a file explorer and each click between folders taking awhile. I was thinking it might have been a weird process taking over the cpu but whenever i look at task manager its usually never above 20%. EDIT: I also am on the current bios revision In case it helps, here is my computer specs: Ryzen 9 5900x running at stock Asus ROG Crosshair VIII Dark Hero 32gb G.Skill Trident Z RGB EVGA GeForce RTX 3090 FTW3 ULTRA HYBRID Boot Drive is a Sabrent 1tb Rocket NVME PCIe gen 3 m.2

Hello everyone! First post here after reading a lo and not finding proper answers! First the machine specs: Laptop model: Asus 2021 ROG Zephyrus G15 - GA503QS model (https://rog.asus.com/laptops/rog-zephyrus/2021-rog-zephyrus-g15-series/helpdesk_bios) CPU: Ryzen 9 5900HS RAM: 32GB GPU: RTX 3080 8GB OS: Win 10 The issue: I do own several USB-C HUBs with mutliple outputs (HDMI, Ethernet, USB Type A, etc) none of them works with the existing USB-C ports of the machine. All drivers are updated and BIOS is also updated to last version. I am not able to plug either a screen or any USB device to the HUB that is connected to either of the two different USB-C ports that the laptop has. All the other USB ports and connections work perfectly fine. After some research I think I stumbled upon a the crappy mess of the new USB standards....The ports are supposed to be "USB 3.2 Gen 2 Type-C support DisplayPort™ / power delivery / G-SYNC" . All the Hubs that I have work fine with my other Intel machines, the one I have been using the most and I need on the new machine is this one (https://www.newegg.com/p/0J2-005J-00016) I do think there is an issue related to compatibility. I just grabbed this laptop for work on the go (currently squeezing UE5 in a AAA project) so having multiple screens, headphones, microphone, wacom cintiq, mouse, multiple gamepads connected at the same time is a must for me. I can handle it for a while connecting and disconnecting stuff around....but not ideal. Do you know of a good USB C that really works with USB3.2 Gen 2 Type-shutthefuckupwhyyoudothis?!??!?! protocol? Do you know for sure this isn't related to a poor usb implementation from AMD/ASUS side? I don't think is driver related, but did you have any driver issues related to this? Let me know If I there is already a similar topic on the forums, wasn't able to find it. Thanks for any help you can give me!

I am having an issue with my 5900x build I just built, I can't seem to get my pc to post if I raise my FCLK clocks to anything higher than 1600MHz. Even 1600MHz I have had my pc randomly restart out of nowhere so I have to use 1500MHz. I am also having an issue with popping and crackling in my audio when I listen to anything. It seems to get worse the higher I go in FCLK clocks. I thought it was my RAM at first not allowing me to post but I am now running my XMP profile for 4000MHz CL18 and running the FCLK at 1466MHz since the crackling and popping isn't as bad as 1500MHz. I want to figure out if I need to RMA my CPU or if I am just not setting something up right in my BIOS. I have tried undervolting and overvolting my SoC and it hasn't really changed anything, I am getting a ton of WHEA errors in event viewer as well and don't know why.

Hello all, I need some help choosing the best performing RAM for 5900x and ROG X570-F GAMING. Capacity: 32+ GB Thanks in advance!

Hello everyone, This is my 1st post here. Hoping to get some feedback from you as I did not get that lucky on Reddit (and I'll be happy to help on the forum as well wherever I can with the little knowledge I gained already). But as it's my 1st one, a quick intro : I'm 41, from the countryside of france, enjoy riding my bike and video games (fps mostly now), not that experienced w/ pc assembling and overclocking (although I did build my own pcs 20 years ago..). Ok so enough for the tinder presentation and let's get serious : The emotional part After selling 3 of my kidneys (one of the advantages of living near a nuclear power plant), I managed to build the following rig : aorus x570 xtreme in rev.1.1 (yeah it's overkill, but shhhh) + r9 5900x (1st time for me w/ an amd cpu on a desktop) + nzxt z73 (full build here or in my profile) all that stuffed in a BeQuiet DB Pro Rev2 on which I added a 3rd SilentWings 3 at the front. So I got 3xSW3 (140mm) on the front, 1xSW3 same size at the back, and the z73 fans (3x120mm) oriented towards the top of the case. By "managed to build" I should mention that I only picked the components and the actual build was made by pros (so no idea what thermal paste was used but I trust this store and given my skills in cable management well...I'm pretty sure I made the right choice ). Got my beast end of June. Things were going smoothly and me and my pc were running hand-in-hand on rainbow unicorns in slow-motion in the heavens of video gaming. Then, "it" happened. NZXT CAM. I was tempted. I knew the feedback was not that good on the soft from what I had seen here and there. But the RGB god smiled at me, then I looked at this nice display on the Z73 which was only displaying the CPU temp over a dark screen, and that was it : "Worst case scenario, I'll uninstall it" was I thinking. Ahahah, so naive.. So I installed CAM, and suddenly...the Z73 fans, which I had NEVER heard until then, kicked in at max speed (wtf!). The CPU temp displayed 65°C, then it went down a little and the z73 fans progressively slowed down. I then noticed that when booting the OS (win10), CPU temp was over 60°C (doing nothing in particular w/ the OS), and then when playing (mostly CoD BO4) I could even reached 91°C (!). I originally blamed the CAM software, but without really understanding the causality between this behavior ('had my aio fans playing yo-yo) and the soft. Were my aio fans not working properly before ? (as I never heard them). Was the cpu temp really that high at the time - had I missed sthg / not paid attention to it before ?? But more importantly : Was I the witness of a stranger-thing'ish with an alien dimension opening in my room and injecting the whole global warming all at once in my case ? Ok, enough with the conjectures. Time to put the glasses on, roll up the sleeves, pay a chaman, then read and measure stuff. Quick study Now, a quick reading about the Ryzen introduces the Core Performance Boost notion to my eyes, and I understand it is enabled by default (and should be fine this way). Going into the advanced settings of the MB uefi, I realize it's kind of a mess in there, to say the least...but the mobo is quite new so I get it. Core Performance Boost can be found in 2 different places (!) : 1 option in the "Tweaker" menu, and 1 same (??) option in the CPU common settings located in the AMD overclocking menu. So, 1st, I decide to run some Cinebench R23 measurements (no tweak at all, all default) - room temperature was pretty hot, 28-30°C : CPB is then in auto mode (I can see that the cpu clocks @4.4-4.5 Ghz) : multi-core : 20,099 pts (the score is decent but compared to what I see online from you guys, I kind of expected a bit more here even w/o any OC) single-core : 1,533 pts CPU Temps : max : ~81°C min : ~ 60°C Max VCore : 1.51V See the screenshot here : Note : I maxed the front/back SW3 fans @1000rpm (dont like that, it's noisier) front panel opened. CPU max temp reached 82°C (looks pretty high to me) CPU temp value indicated by Ryzen master (once the test was over) is 52.11°C whereas I get a reading of 66°C by CAM, about the same (67) w/ AIDA64 -> seems like CAM / Aida values are the CPU die values whereas Ryzen is rather based on the core temperatures). I'd rather have CAM to do the same but heh.. Then, I disable the CPB option located in the Tweaker menu : CPB disabled (cpu clocks at stock @3.7Ghz) : multi-core : 17,634 pts single-core: 1,207 pts CPU Temps : max : 63°C min : 42°C Max VCore : 1.1V So...just by disabling this option in the bios, I saved 20°C. See screenshot here : I then ran my fav game, Call of Duty Black Ops 4, in which I was reaching a temp of 91°C in spike after a few mins of gaming (w/. CPB on), and I kept that -20°C as I was around 70°C max. I didnt seem to lose any fps as I was still around 230 fps in 1440p (so clearly enjoyable...); but the game is from 2018 and not sure how heavily it relies on the CPU (the 3090 does help though :p). Ok that makes sense, lower tensions, lower freq. used etc...but keeping the CPU @base freq without the turbo is kind of a shame for such a configuration. So for now, my actual setup, I keep deactivated the CPB but I set the core multiplier at 40 instead of 37, and I'm now running @4Ghz. Results are good on Cinebench "compared to" what I had w/ the CPB mode on : CPB disabled - core multiplier at 40 : multi-core : 19,865 pts single-core: 1,307 pts And the temperatures are still pretty "cool" for that cpu : still 42°C min and around or less than 71°C max. I should also state that the windows power settings were/are in "balanced" mode. Now, with all that being said.... Questions : 1. What do you guys think of these results, do they look poor, am I missing something somewhere ? I expected cooler temperatures and higher results on the bench tbh. 2. Does anyone know which option superseeds the other between the "tweaker" options and the one we find in the AMD OC settings ?? 3. Are there any advanced documentations (being text, vids, etc i don't care) that would explain in details each settings in the bios of the x570 aorus xtreme - I've read the manual, it is well done and quite clear "but" it misses lots of options descriptions as well "details" on each of those. If there any good tutorials to learn how to better tweak the Ryzen 9, I'd be glad to look at them! 4. Also, something I did not mention above : I uninstalled CAM before re-installing it, and when CAM is not installed : the metrics on the Z73 screen are frozen and, more importantly, the fan speed will also stay static and won't change even if the temp is getting high. It's as if the Z73 imperatively needs CAM installed to work properly. I had read from a NZXT answer on Amazon (to a customer) that only the RGB would be off so I'm a bit surprised here (cables look correctly plugged on the mb). Anyone else who would have remarked this as well ?? Overall it feels that there's some soft update needed in the drivers (chipset maybe) regarding the way CPB works. I dont get why it's so agressive even when not doing anything on the operating system. Clocking very high and therefore inducing high temps when ...nothing is done in particular (ok some background processes are always running but the cpu load is very very low) simply does not make sense.... I'm curious to see if anyone is experience similar things ??? Oh, and thanks for reading up to here if you made it :).

basicly. it restarts itself. but only when being maxxed out at 100%. however. its not overheating. nothing on the system is highter than 60c. and it only seems to happen if i play spotify while waiting on what would be sub 10 min renders for a whole animation in maya? Its not a massive issue tbh but if its a sign of some kind issue that could get worse or setting that needs to be sorted to improve stablity then i want to diagnose it now rather than when i have a University deadline coming up. the only reason this is weird for me is that my old system that had half the RAM and was running a Intel i7-5820k and would trundle along like it had a deathwish to die doing what it loved. and that system was very temprimental at times like as in genuinely it had a personality that took joy in cutting years off my life by freaking out every 10 - 14 months. I dont really know what the underlying issue could be here. and i know the easy answer is not to listen to spotify while im rendering but again i just wanna make sure this isnt the precersor to a much worse problem a year down the line Specs: Ryzen 9 5900x 32 gb Corsair vengance rgb 3600mhz Gigabyte GTX 980 4GB (im waiting on 30 series to free up) asus b550 f wifi 1TB nvme samsung 970 evo ssd 2x 1TB 860 evo SSD 2x 2TB segate barricuda HDD Corair H100i Elite 240 AIO Corsair RM850i