Post your 8700K overclocks/advice

Sup fellas. Just wanted to see what you guys running 8700K's are doing to get your CPU's to overclock and what kind of overclock's you are obtaining? I always seem to do shitty when it comes to the Lottery.

My 3770K would only hit 4.4 stable but ran at 4.4 24/7 like a champ. My new 8700K seated in a Asrock (My first time using them) Z370 extreme4 has only been able to hit 4.7 GHZ stable. I can boot into windows at 5 GHZ, but not really stable

unless I pump like 1.41 volts into it with an LLC of 1. Running prime95 with AVX on, I get errors immediately running any overclock over stock and IBT V2, I get this wierd issue where my screen will turn black and all I can do is reboot the PC.

4.7 seems very stable but I have to disable c-states, etc. or I will get a random BSOD just sitting on the desktop, I would assume it's because of the low voltage once it kicks in. I went with AIO corsair 240mm cooler, and temps are fairly in check. Any replies/advice would be appreciated.

Island said:

Sup fellas. Just wanted to see what you guys running 8700K's are doing to get your CPU's to overclock and what kind of overclock's you are obtaining? I always seem to do shitty when it comes to the Lottery.

My 3770K would only hit 4.4 stable but ran at 4.4 24/7 like a champ. My new 8700K seated in a Asrock (My first time using them) Z370 extreme4 has only been able to hit 4.7 GHZ stable. I can boot into windows at 5 GHZ, but not really stable

unless I pump like 1.41 volts into it with an LLC of 1. Running prime95 with AVX on, I get errors immediately running any overclock over stock and IBT V2, I get this wierd issue where my screen will turn black and all I can do is reboot the PC.

4.7 seems very stable but I have to disable c-states, etc. or I will get a random BSOD just sitting on the desktop, I would assume it's because of the low voltage once it kicks in. I went with AIO corsair 240mm cooler, and temps are fairly in check. Any replies/advice would be appreciated.

Click to expand...

I have a practically identical situation. Tag for advice

My advice would be to delid it...that's what I'm doing with my new 8700k tonight, mount your rad in the front of the case and push air into the rad, check your waterblock is mounted tight with the cpu. My temps gradually go from 85-95c at full load 5.0ghz oc when I do prime 95 non-avx for 1 hour at 1.35v...I could probably lower the voltage some also..but I rather go with the biggest culprit which is the shitty mayonnaise intel uses under the heatspreader.

Based on SL, 88% of 8700Ks can hit 5ghz(@1.4v) and 99% can hit 4.9ghz(@1.385). I don't know anything about the behaviour of the Asrock Extreme 4, but typically motherboards outside the highest tier VRMs(Asus ROG stuff, etc) will require a bit more voltage or high LLC settings to operate correctly. For example I run my 5.2ghz 8700K at 1.43V(slightly higher than the recommended 1.425v) with LLC6 on an Asus Z370-G.

Note that this all presumes delidding, which IMO is essential for OCing to 5ghz or above. Otherwise you are going to be hitting thermal issues in prime95 tests almost immediately with a 240mm AIO or any other remotely normal cooling solution.

P.S. If you are running prime95 without AVX disabled, you will need an avx offset of at least -2 on most OCs at 5ghz or above. If a CPU can run prime95 at 5ghz without AVX offset, that means you could run it at 5.1 or 5.2 with an offset easily.

I ordered my CPU from SL, they delid and bin which is nice. Mind you the percentage hit X mhz is based upon the CPU after it's been delidded. I have mine stable at 5.2GHz 1.42 v. Exactly as what they promised me when I ordered it. As Sancus pointed out, SL also uses an AVX Offset of 2.

Running at 5.0Ghz, 1.296 volts with 0 AVX offset. Passed a number of stress tests.

I'm delidded with a custom loop. I only delidded as I was hitting a thermal limit of 100C while running the latest version of Prime with AVX instructions. Of course wanting to get the maximum out of the hard work I put into my custom loop I removed the thermal paste and went with liquid metal.

Frustrating since the thermal paste essentially creates a cooling bottleneck.

I still hit 80c delidded at 1.26 vcore doing prime without AVX, seems like 4.9 is the highest I can go with a reasonable vcore. I'm pretty sure the 80f room temps dont help.

Is 1.42 vcore even safe?

TheMadHatterXxX said:

Is 1.42 vcore even safe?

Click to expand...

The best guarantee that exists is SL's 1-year warranty at up to their recommended 1.435V(for 5.3ghz). Nobody on this forum or elsewhere can give you any guarantees because they're not collecting data and Intel doesn't provide any.

In my opinion, yes, voltages up to 1.45V are perfectly safe for 24/7 running and voltages up to 1.5V MAY be safe depending on your expectations for processor longevity and how often you load your CPU. I have yet to find any report online of voltages under 1.5V causing degradation on Sky Lake, Kaby Lake, or Coffee Lake. I have found a few reports of 1.5V on Sky Lake causing degradation after many months(12+) running flat out on folding type scenarios. Voltage information from architectures prior to Sky Lake is useless and doesn't apply. In most cases, people are not running their processor flat out all the time, and that's what exacerbates degradation. If your CPU is not at load then no significant current is running through it so it won't be degrading even if the voltage is relatively high.

BTW, degradation means a previous stable overclock becoming unstable. That is the actual risk that higher voltages pose. Processors don't just die from mild overvolting like this, they'll just become less stable and you won't be able to run as high of an overclock, over time. This is difficult to diagnose because many people aren't actually running stable overclocks, their testing just hasn't hit instability... until they use some software that does.