i7 860 vdroop

Shayper

Shayper

Shayper

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Hi there.
Just been messing around stress testing my i7, and just noticed in CPU-Z that the voltage, upon full load being administered (prime small fft's) drops from 1.424 to 1.342 volts, and then back up to 1.368.
Anyone got any ideas as to why this happens, and how to avoid it? (have a nasty feeling it may be making my pc slightly unstable :rolleyes:)

Thanks a bunch for the help, Ryan :)
 
That's vdroop. Does your bios have an option to turn on Load Line Calibration? That is designed to reduce or get rid of vdroop altogether. Wether you have vdroop or not, the key is to set your voltage in bios such that under load your chip gets what it needs to run stable. If you have lots of vdroop you'll have to set your bios voltage a bit higher so that it droops to the correct level under load. This will mean your idle voltage is high and your idle temps might be higher too, but meh - load is what matters. On my mobo I have two levels of LLC I can choose from. Level 2 goes even further than cancelling out vdroop so my voltage actually rises slightly under load. This means my idle volts are a little lower - seems like the right way round to me :)
 
Thanks a lot :)
Yeah, I do have LLC enabled, and spread spectrum. Spec as in sig; do you know any problems with this board?

Considering this is my first ever high overclock, is 4.2ghz attainable stably? I just chucked every voltage setting (apart from ram obviously :)) to one step below the redline, and kept the vcore and vtt to within 0.2v of each other like you are supposed to, do you reckon that will manage it? (running prime95 atm, small fft's :))

Cheers, Ryan
 
I dunno - my i5 is stable at 4 GHz about 1.38V under load. I can go 4.2 but volts and temps are a bit mental so i dont bother. 4.0 is the sweet spot for me. If you can keep temps under control, maybe you just need more volts. Looks like the LLC isn't doing a great job on your board. You might need some crazy bios/idle volts to get the drooped load voltage you need!
 
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