Originally Posted by grambo
Two questions re: P8Z77-V Pro overclocking:
1) I was under the impression hitting "apply" to settings in TurboV Evo would write them to the UEFI, but when I reboot my OC settings are not there. Anyone know how to make it happen? I'm curious if TurboV Evo is using an offset voltage (I think it is, a positive one since voltage lands on 1.2V when set to 1.165V in TurboV = +0.35 offset) and I want to know what that voltage is, as my ultimate goal is to tune the machine in UEFI to use the lowest BIOS at idle/load as I possibly can.
2) If I now know that I need about 1.2V for stability at load, what would the optimal offset settings be to achieve this (and still maintain lower voltage at idle to save power/heat)? In the Asus Z77 videos they recommend negative offset and regular LLC? Is it a guessing game of booting with auto and seeing what voltage it applies, then running an offset? TurboV doesn't let you touch offset from what I can tell.
I recently built a new IB system using an Asus P8Z77-V Pro and last night finally got around to playing with the overclock. I used Asus' TurboV Evo software to auto tune it to get a ballpark of what the chip would do, and then manually started lowering the voltage while doing LinX passes.
Ended up settling on 45 x 100 = 4.5GHz with all every setting at default except CPU voltage in TurboV Evo at 1.165V. This effectively results in peak voltage under LinX load at 1.2V, CPU cores peaking at 70/79/74/75. For stability I ran LinX for 5 passes (49m56s 103.67Gflops) and had a 3 hour gaming sessions (2h 64 player BF3, 1h Mass Effect 3). I will run a longer ~20-30 pass LinX test to verify once I nail down final settings.
1) it does not right to UEFI, but you can use it to test and then manually put into bios.
2) I would have said what you said, and experiment until you find the same vcore in cpu-z set as offset in bios as yo uhad through software.
However today I updated my bios, and set everything except the offset (normally -0.01) my voltage at 4.3Ghz was 1.28 vs my normal 1.1V (an apparent offset of -0.18 required).
Testing in software and got back to indications that a -0.01V offset was required, set it and all ok. Its all a bit odd.
Now I don't use any LLC control, I believe that if I did I would have a lower idle voltage at the same load voltage, which would threaten idle stability, whilst providing no real benefit in temps as I am idling at 30-33C.