i5 8600k Overclock speed, voltage and temperature

[ElderNoob]

Hi Guys,

 

   So it’s my first time to do overclocking and will want to get Your opinion and advice on the results I got. Please bear with me on reading this. My system as follows:

 

CPU: i5 8600k, OC’ed at 5ghz, 1.325v

CPU Cooler: Corsair H100i v2 (push config, intake at front, changed fans to noctua nf-f12 ippc 3000)

MOBO: MSI Z370m gaming pro AC

PSU: Cooler Master V750 Gold Full Modular

GPU: Zotac GTX 1070 Mini

RAM: 2x8 GB DDR4 2133 (from my old system)

PC Case: Tecware nexus m

Fans: 2 aio rad fans intake (noctua), 2 exhaust at top, 1 exhaust at rear

 

 

Ambient Temp: average 25 degree Celsius

Program used for stability test: Intel XTU (im testing an intel chip, so makes sense to use an intel program?) run it for 1 and a half hour

Temp Monitoring App: HWinfo 64

Others: CPU-Z, Heaven Benchmark

 

So here’s are my enquiries: See attached screen shot

 

a)      Will I be fine at 5ghz, 1.325V? At full OCed load via intel XTU, max temp is at 74 degrees, idle at below 40 deg, Average at 65-70 deg. Voltage barely hits 1.32V, max actual TDP is 80W

b)      I have another OC profile which is just 4.5 ghz @ 1.26V, should I stick to this? I don’t do rendering nor video editing. Just some heavy Autocad and 2-3 hours gaming at night. Any significant gain from 4.5ghz to 5ghz for my usage?

c)       Before this test (on screen shot) I OC’ed my RAM from 2133mhz to 2667 mhz via the mobo feature which gives preset OC setting, and I get the blue screen of death with any speed-voltage combination. When I disable it and just returned to back 2133mhz, everything seems to be normal and smooth (so far). Can You educate me what is the reason behind this? I really want to learn new things like this. (my not in a PC/IT line of work). just a casual gamer.

d)      Any advice regarding my case-fan setup? When I run heaven benchmark, CPU usage is below 40%, temps are below 65deg, but my GPU is around 72deg max (not overclocked, fan curve are set at 100% at 60deg).

 

   Thanks in advanced Guys, Cheers!

[orbitalbuzzsaw]

1.325V is a little lower than what I run my 8700K at (1.35 )is so you'll be absolutely fine. With regards to your question about 4.5GhZ I'd say you will experience an improvement at 5GhZ over 4.5 because CAD tends to rely on single core performance IIRC.

[ElderNoob]

14 minutes ago, orbitalbuzzsaw said:

1.325V is a little lower than what I run my 8700K at (1.35 )is so you'll be absolutely fine. With regards to your question about 4.5GhZ I'd say you will experience an improvement at 5GhZ over 4.5 because CAD tends to rely on single core performance IIRC.

Hi, Thanks for the sharing Your OC result, its a relief to kbow my volatge for 5ghz is just fine. How about my temps, is it on the safe side? Also, thanks for the tip that i will benefit in 5ghz speed for CAD. 

[DocSwag]

5 minutes ago, ElderNoob said:

Hi, Thanks for the sharing Your OC result, its a relief to kbow my volatge for 5ghz is just fine. How about my temps, is it on the safe side? Also, thanks for the tip that i will benefit in 5ghz speed for CAD. 

Yeah temps are ok. IIRC XTU isn't super heavy tho, you might want to stress test with something like Asus Realbench to make sure OC is stable. I might be wrong tho

[ElderNoob]

14 minutes ago, DocSwag said:

Yeah temps are ok. IIRC XTU isn't super heavy tho, you might want to stress test with something like Asus Realbench to make sure OC is stable. I might be wrong tho

I actually have prime 95, but i red articles saying that its a ridiculously unrealistic test program. so i chose XTU, yeah not so heavy but more realistic loading? ill try out asus real bench. any advice how long should I run it to make sure everything is stable?

[DocSwag]

1 hour ago, ElderNoob said:

I actually have prime 95, but i red articles saying that its a ridiculously unrealistic test program. so i chose XTU, yeah not so heavy but more realistic loading? ill try out asus real bench. any advice how long should I run it to make sure everything is stable?

Yeah prime95 is a bit overkill IMO, but if you want utmost stability then it's the best option.

 

One hour would probably be good just to be safe, but if you're impatient 15 minutes might be ok

[ElderNoob]

1 hour ago, DocSwag said:

Yeah prime95 is a bit overkill IMO, but if you want utmost stability then it's the best option.

 

One hour would probably be good just to be safe, but if you're impatient 15 minutes might be ok

So i just finished an hour of prime95 test just now (Blend Test), it didn't crash nor stopped, HWinfo64 never showed any kind of throttling.

 

However, a couple of cores showed max temp of 92 at some point, but most of the time its between 75-85 deg. Is this healthy?

 

Also i noticed the TDP from XTU running on the background, I saw it showed briefly some 115W TDP, i remember the TDP of i5 8600k is just 95W..is it ok? it never registered any throttling due to this though. and mostly it sits at 80W TDP..

 

and lastly, my OC is 5ghz, how come when i run prime95, CPU-z and XTU only showed 4.7ghz @ 100% utilization? does it mean it only tested 4.7ghz instead of 5ghz?

Edited June 30, 2018 by ElderNoob
Added an info

[DocSwag]

11 hours ago, ElderNoob said:

So i just finished an hour of prime95 test just now (Blend Test), it didn't crash nor stopped, HWinfo64 never showed any kind of throttling.

 

However, a couple of cores showed max temp of 92 at some point, but most of the time its between 75-85 deg. Is this healthy?

 

92 is usually a bit high, though I think that since prime95 is so unrealistically hard on your CPU that in day to day usage it should be fine.

11 hours ago, ElderNoob said:

Also i noticed the TDP from XTU running on the background, I saw it showed briefly some 115W TDP, i remember the TDP of i5 8600k is just 95W..is it ok? it never registered any throttling due to this though. and mostly it sits at 80W TDP..

The 95w is only at stock. When you OC it's gonna increase the TDP by a lot... I reckon the 115W also isn't 100% accurate as your CPU is probably pulling a lot more than that.

11 hours ago, ElderNoob said:

and lastly, my OC is 5ghz, how come when i run prime95, CPU-z and XTU only showed 4.7ghz @ 100% utilization? does it mean it only tested 4.7ghz instead of 5ghz?

If that's the case it's probably only running at 4.7. Look in your bios to see if there are any AVX offset settings... That might be the reason.

 

AVX workloads stress the CPU a lot more than normal, and Prime95 includes AVX workloads. You should be able to set an AVX offset in your bios so that, say, if you're running at 5 ghz when under AVX your CPU will go down to 4.8.