8700K - Still at 4.7 at 1.34v - Is there anything missing?
8700K - Still at 4.7 at 1.34v - Is there anything missing?
When attempting OC I struggle to reach more than 4.7GHz at 1.34v (voltage appears unusually high). With Prime95 (AVX) I experience no BSOD after 1.25v, but at that voltage six of twelve workers crash due to rounding errors. It takes up to 1.33v for all workers to stay stable initially, though one worker fails after about five minutes. At 1.34v, all workers remain stable for over fifteen minutes. Am I missing something or did I lose a significant amount?
I didn't realize you were stable at 1.30v, but please confirm once your LLC is properly set so there are no fluctuations above 1.34v (or below). Then in the BIOS, manually adjust the Vcore to 1.30v. Also, ensure adaptive voltage is active and C states are enabled if you want to reduce power consumption to 0.8v at idle.
Initial temperatures are quite elevated, so I plan to cap them at 80°C for Coffee Lake.
Have you experimented with the LLC settings before? If your vcore performance drops below the target under load, raise the LLC level by one step until that issue resolves.
I attempted to configure the LLC to High, but the voltages were at 1.4x and temperatures reached mid-80s, so I stopped it. I wasn't expecting a 1.4v just from a 4.7 OC on an 8700K. This is my first OC experience, and I'm not fully grasping LLC settings. It might be better to start with the lowest LLC setting and increase it later. I have (Low, Med, High, Turbo, Extreme). If I adjust the LLC, should I maintain a stable vcore of 1.34 or lower it initially?
Your application has too much LLC, reduce it until it matches the vcore you set in BIOS (around 1.34v).
You might still get 4.8-4.9ghz with a decent chip.
Yes, you can adjust your BIOS VCore to 1.30 and tweak the LLC to stabilize the voltage, which should bring the idle voltage down from 1.34V to 1.30V.
Almost. You wish to keep at 1.34v and boost the LLC so you remain consistently at that speed regardless of conditions.
Almost. But you should keep it at 1.34v and raise the LLC so you remain consistently at that speed, no matter what.
I was just wondering why you’d waste the extra 0.4v when the voltage drops to 1.30 under load and stays stable. Honestly, I’m not really grasping the technical details of those voltage changes.
I didn't realize you were stable at 1.30v, but please confirm once your LLC is properly set so there are no fluctuations above 1.34v (or below). Then in the BIOS, manually adjust the Vcore to 1.30v. Also, ensure adaptive voltage is active and C states are enabled if you want to reduce power consumption to 0.8v at idle.
Thanks for all the advice. LLC appears to be the main factor here.
Currently operating at 4.9GHz with BIOS vCore 1.30v.
LLC setting is medium, matching Gigabyte’s standard modes.
AVX offset is 2.
Using Prime95 (with AVX) shows stability for about 30 minutes before one worker stops. Temperatures were around 85°C during rest and 80-82°C while running.
For a gaming PC without heavy tasks, would this remain stable even after one worker fails after 30 minutes of AVX usage? I’d prefer to avoid additional temperature readings if possible. Also, it seems the same core consistently dies first, usually the cooler one.