Originally Posted by Vioxtac
I recently set my 4790K to 4.7 GHz, set in a manual voltage of 1.255, enabled C states and let it run. It's stable. However under pretty much any load, according to HWinfo, VCore rises to 1.264 easily. When stress testing VCore rises to a maximum of 1.280. VCore also rises to 1.280 every once in a while during gameplay (once per 2 hours) to keep up with the extra load. Temps get to maximum 83C when stressing and maximum of 70C when playing extremely intensive games (usually no more than 60C though).
I've been told it's okay by some people. But others claim to be running at lower voltages (like 1.250) for safety reasons, and this frightened me a bit.
Is 1.280 safe? How much degradation will it cause? Will it lower the 4790K's lifespan? Are the temps fine?
Please reassure me guys. :S
Yeah whoever told you that ~1.265 - 1.28v or so was BAD has no clue what they are talking about. For example, my i7 5960X i overclocked to 4.5ghz at 1.3v vcore (have since been able to reduce to 1.28v if i go 1.95v input voltage, but haswell-e is a tad different so consult a 4790K guide about input voltage) for quite some time and its fine. A lot of people run their Haswell-E chips at 1.35v or even close to 1.4v all the time and are usually fine. On Haswell and Haswell-E you are USUALLY fine (as in not dangerous) at anything under around 1.45v. However for "long term" constant use, you want to try and stay below 1.35v or so. If you keep the chip below 1.3v it literally has near no effect on the CPUs lifespan; so at 1.265 - 1.28v range you are PERFECTLY fine.
The temps are perfectly normal too. 83C during stress tests happens, what is your cooling setup? Air? An AIO water? The only reason i'd be concerned about 83C stress temps is if you had a custom full sized water loop with several radiators etc.. on like a Corsair H100i or something or a 212 Evo etc.. 83C in stress if perfectly normal. Intel chips don't throttle at all until they peak over 90C temps anyway.
Rule of thumb, for 24/7 use, try to stay at around 1.3v or lower and 80C or lower max gaming load temps and you're ok. If custom water loop 1.35v is as safe as 1.3v since the water provides lower temps. Seriously though you're fine man.