Check if operating your 6600K at 4.8 GHz with 1.42v is within safe limits.
Check if operating your 6600K at 4.8 GHz with 1.42v is within safe limits.
What maximum voltage are you applying when AVX is active? I anticipate around 1.55, which is a level I wouldn't wish to encounter.
I don't suggest synthetic tests mainly because I've experienced passing a two-hour synthetic test while failing an application-based benchmark. Use HWiNFO (just sensors) and monitor the Vcore peak during the eight-minute RoG Real Bench test.
I haven't used AIDA64 in roughly three years, so it's important to note which test was run under AIDA. However, if you stay below 1.48 - 1.50 instantaneous—especially when AVX is enabled—and 1.40 - 1.41 peak instantaneous during non-RoG Real Bench runs—I have no concerns.
Each additional 0.1 GHz typically demands significantly higher voltage. The temperatures appear quite low as well. If being...
What cooler are you using? The 59c performs well at that voltage during a stress test. Those temperatures should be okay. However, I've heard that handling a lot of 6600k's reaching 4.8ghz needs a significant voltage increase. If it can run smoothly at 4.7ghz with 1.35v, then raising it to 1.42v doesn't seem necessary. The same applies to my FX CPU—it works stably at 4.7ghz with 1.45v, but pushing to 4.8ghz requires about 1.5v, which I don't think is worth it.
What cooler are you using? The 59c performs well at that voltage during stress tests. At those temperatures it should hold up. However, I've heard that handling many 6600kHz devices at 4.8ghz demands a significant voltage increase. If it needs to run smoothly at 4.7ghz with 1.35v, raising it to 1.42v wouldn't be justified. The same applies to my FX CPU – I can stabilize at 4.7ghz with 1.45v, but pushing to 4.8ghz requires about 1.5v, which doesn’t seem worthwhile. Diminishing returns are the case here.
I own a Cooler Master Seidon 240V. Regarding lower frequencies, for stable 4.7 performance I’d need around 1.39v.
What voltage are you applying (maximum) when AVX is active? I’d anticipate around 1.55, which is a level I wouldn’t wish to encounter.
I’m not a fan of synthetic tests mainly because I’ve experienced passing a two-hour synthetic test while failing an application-based benchmark. Use HWiNFO (just sensors) and observe the Vcore peak during the eight-minute RoG Real Bench test.
I haven’t used AIDA64 in about three years, so it really depends on which benchmark you ran under AIDA. However, if it stays below 1.48–1.50 instantaneous when AVX is enabled and 1.40–1.41 peak when running RoG Real Bench, I wouldn’t have any worries.
Each additional 0.1 GHz would likely need a significantly higher voltage. The temperatures appear quite low too. If pushing the CPU to its limits, it must be one of those exceptional chips that only a small percentage of users encounter. But with your cache ratio at 4.8, that’s probably the lowest temperature I’ve ever seen.
I’d suggest setting the cache (ring) multiplier to 3 below the CPU multiplier, as there’s no noticeable performance drop until it exceeds three, and even then only in certain applications.
http://dlcdnmkt.asus.com/rog/RealBench_v2.44.zip
https://www.hwinfo.com/
I have my 6600K running at 4.7GHz at 1.39v. CPU power wattage in the 80s. Max temp is in the mid 60s Cooler used is nothing special- Corsair H80i, fans stayed below 1200rpm.
I've switched the CPU power to adaptive, holding at 1.39v when under 100% load and momentarily peaking to 1.41v.
I've not really put much effort in to reaching 4.7GHz, and i'm sure this chip can be pushed further, but is it worth it?
If you feel you can keep your temps in the 70s under constant load, you can try pushing your chip as JackNaylorPE has suggested, but it comes down to power consumption vs gain, reduction in lifespan of you chip, as well as the capability of your individual chip (silicon lottery).
From what I've read, 1.45v seems to be the absolute extreme constant voltage overclockers seem to be comfortable with, but it really is at your own risk.
If there isn't a real world/ practical reason for you to push your CPU to a cliff edge, I wouldn't risk it.
Be happy with a thermally efficient stable overclock, as most are running between 4.5-4.6GHz OC for a 6600k