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BurningSky

Advice for overclocking a 8700k

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Posted · Original PosterOP

Hi,

I just built a new pc based around a 8700k and I would like to overclock it a little to get some more out of it. I have never overclocked before so was hoping for some suggestions on where to start and what to aim for in terms of clock rates. I've seen some say around 4.3-4.5ghz but is that feasible with an air cooler?

 

I'm running the 8700k on a ASRock Z370 Extreme4 with 16GB of G.SKILL Ripjaws V Series 3000mhz ram. I'm cooling it with a Noctua NH-U12S and have a Corsair CX750M 750W 80 PLUS Bronze psu. 

Thanks!

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Just use any i7 7700k oc Guide our therre, there shouldn’t be much difference.

5GHz would be a really nice oc already, but the problems will be due to thermals like they were on the 7700k.

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Personally, I use hwinfo64 to look at temperatures of each core while overclocking. I also find it easier to use Intel XTU to overclock in Windows than the more traditional bios approach. I find it easier to fix all cores at the same clock. Increase multiplier for speed, increase voltage for stability, stop when your temperatures under load are too much. I don't know what a 24/7 safe voltage is but I wouldn't stay above 1.40v.

 

The U12S may be the limiting factor here. I'm using a D15 on 8350k and that's great. At +275mV offset (all my mobo allows) that gives around a reported 1.4v, and it seems stable in everything except Prime95, where from memory I have to use AVX offset to drop it to 4.7 GHz. Based on few reports out there, a bad sample of Coffee Lake might only reach 4.8, typical around 5.0, a really good one (without extreme cooling) 5.2.

 

Also note there is a big difference between turbo to 4.7 (single core), and overclocking all cores to 4.7.


Main rig: Asus Maximus VIII Hero, i7-6700k stock, Noctua D14, G.Skill Ripjaws V 3200 2x8GB, Gigabyte GTX 1650, Corsair HX750i, In Win 303 NVIDIA, Samsung SM951 512GB, WD Blue 1TB, HP LP2475W 1200p wide gamut

Gaming system: Asrock Z370 Pro4, i7-8086k stock, Noctua D15, Corsair Vengeance LPX RGB 3000 2x8GB, Gigabyte RTX 2070, Fractal Edison 550W PSU, Corsair 600C, Optane 900p 280GB, Crucial MX200 1TB, Sandisk 960GB, Acer Predator XB241YU 1440p 144Hz G-sync

Ryzen rig: Asrock B450 ITX, R5 3600, Noctua D9L, Corsair Vengeance LPX RGB 3000 2x4GB, EVGA GTX 970, Corsair CX450M, NZXT Manta, Crucial MX300 525GB, Acer RT280K

VR rig: Asus Z170I Pro Gaming, i7-6600k stock, Silverstone TD03-E, Kingston Hyper-X 2666 2x8GB, Zotac 1070 FE, Corsair CX450M, Silverstone SG13, Samsung PM951 256GB, HTC Vive

Gaming laptop: Asus FX503VD, i5-7300HQ, 2x8GB DDR4, GTX 1050, Sandisk 256GB SSD

Total CPU heating: i7-7800X, i7-5930k, i7-5820k, 2x i7-6700k, i7-6700T, i5-6600k, i7-5775C, i5-5675C, i5-4570S, i3-8350k, i3-6100, i3-4360, i3-4150T, E5-2683v3, 2x E5-2650, E5-2667, R7 3700X, R5 3600

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Posted · Original PosterOP

Thanks for all the advice, I have the XTU tool because I thought that might be the easiest route for a first time. So if I aim for about 4.8-5 on all cores what should I aim for on the turbo? Would a load temp of around 80 be reasonable or is that too high?

I'll have a read of some 7700k guides.

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The way overclocking works is that it is a kinda permanent turbo. Personally I work on getting all cores to the same higher clock and leave it. It may be possible to push fewer cores to even higher clocks, but that's more work. Temps are a bit more tricky. Personally I aim to keep it not much beyond 70C. I've had systems that were stable at 70C, and unstable at 80C without changing any settings, simply from the seasons changing.


Main rig: Asus Maximus VIII Hero, i7-6700k stock, Noctua D14, G.Skill Ripjaws V 3200 2x8GB, Gigabyte GTX 1650, Corsair HX750i, In Win 303 NVIDIA, Samsung SM951 512GB, WD Blue 1TB, HP LP2475W 1200p wide gamut

Gaming system: Asrock Z370 Pro4, i7-8086k stock, Noctua D15, Corsair Vengeance LPX RGB 3000 2x8GB, Gigabyte RTX 2070, Fractal Edison 550W PSU, Corsair 600C, Optane 900p 280GB, Crucial MX200 1TB, Sandisk 960GB, Acer Predator XB241YU 1440p 144Hz G-sync

Ryzen rig: Asrock B450 ITX, R5 3600, Noctua D9L, Corsair Vengeance LPX RGB 3000 2x4GB, EVGA GTX 970, Corsair CX450M, NZXT Manta, Crucial MX300 525GB, Acer RT280K

VR rig: Asus Z170I Pro Gaming, i7-6600k stock, Silverstone TD03-E, Kingston Hyper-X 2666 2x8GB, Zotac 1070 FE, Corsair CX450M, Silverstone SG13, Samsung PM951 256GB, HTC Vive

Gaming laptop: Asus FX503VD, i5-7300HQ, 2x8GB DDR4, GTX 1050, Sandisk 256GB SSD

Total CPU heating: i7-7800X, i7-5930k, i7-5820k, 2x i7-6700k, i7-6700T, i5-6600k, i7-5775C, i5-5675C, i5-4570S, i3-8350k, i3-6100, i3-4360, i3-4150T, E5-2683v3, 2x E5-2650, E5-2667, R7 3700X, R5 3600

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Posted · Original PosterOP

So do you essentially disable turbo mode? In XTU am I looking at setting multipliers across the active cores or at the processor cache ratio level to get it to ~5ghz? And am I setting the "Core Voltage" rather than the "Core Voltage Offset"? Should I go for 4.8 first with no voltage and see what happens or set a speed and voltage at a certain level then dial back?

Base XTU Settings.PNG

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Use whatever approach you want to take, some people like to just push their cpu as far as possible with stock voltage, others tend to squeeze every little drop of performance out of it :P

if you set your goal at 5GHz just set the voltage to your personal maximum (would be 1.35v for me). And see if it’s stable. If so that’s great and you can dial back the voltage slowly until you find the lowest stable voltage.

If you aren’t stable at max voltage you can reduce frequency slightly and retry, or try to push the voltage even higher to a certain degree (1.4v is the absolute maximum imo). 

Always keep an eye for your thermals though. They increase with increasing frequency and even more with voltage.

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When overclocking Coffe Lake I think you should stay under 1,35V on CPU core.

Then just test how far can you get your CPU ... test stability with aida64 or prime95. If your CPU goes over 90°C with those tests, dial back your OC to prevent any CPU damage. 


Intel i5 8600k 5.0GHz | EVGA Z370 Micro ATX | Dark Rock 3 | ADATA XPG Z1 3000MHz 32GB | RM650x | GTX 1080 Ti EVGA SC2 | Thermaltake Core V21

Samsung EVO 960 M.2 250GB | Samsung EVO 850 250GB | HyperX Fury 480GB | 3x Be Quiet! Silent Wings 140mm fans

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