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Most of the 6700K won't run stable @4.8GHz on air/water regardless of voltage. Actually adding voltage you can only make it worse ( or you have really good cooling ). If it's "stable" at lower voltage with HT off then probably it's not fully stable. I don't mean long Prime95 tests or anything like that but during normal work or swiching between full load and low power it may crash. This is what I saw on a couple of 6600/6700K and i3 6320.
VCCIO/VCCSA will stabilize almost only memory and memory controller. It can help a bit with cache too. You can try at low cache clock and high cpu to check if there is any difference.
After overclocking you can't look at stock thermal limits. CPU will require lower temps or higher voltages to stabilize signals. Simply when you raise voltage then you have to reduce temp. 90*C+ won't be "safe" temp limit anymore. Maybe for some chips it will be but most will lose stability at lower temps.
The new Bios has the Prime95 Bug update that effects i7 6700k.
If you have K and aren't going back, upgrade it.I downgraded my BIOS to OC my i3 from 3.6 to 4.5. My question : Do I continue running the older BIOS with my new i7 6700K or upgrade to the latest BIOS???? Is there good and bad for still using the old BIOS with the i7???? Coming over from AMD's camp
Thank You For Your Advice
? thought it was the older versions that had the bug ?
Yup!It was the older Bios that allowed the complex workload conditions to crash, then with the new Bios it fixed the problem.
The new Bios has the Prime95 Bug update that effects i7 6700k.