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VDroop-Issue.....any experiences?

post #1 of 28
Thread Starter 
OK, sorry for bugging you all with postings but I really try to get this solved somehow.
My machine crashes about 20 seconds after running prime95 or in comparable differences in CPU load.

via google I found this thread:

http://www.tomshardware.co.uk/forum/...orthos-prime95

which sounds exactly like my problem but does not really offer any help.

Has anyone experiences which option in BIOS handles voltage spikes on an ASUS M4A785-M?

Load-Line-Calibration? If so, which settings should I use, I don't really get what these percentage values mean...

thanks in advance....
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post #2 of 28
Load line calibration is a feature on newer ASUS boards (both AMD and Intel) which does help with vdroop. On my ASUS P5Q-E, enabling load line calibration virtually eliminated all vdroop on the CPU core. If it is currently not enabled, I would enable it and see if that helps at all.

EDIT: Are you currently overclocking the CPU? If so, what frequency is the CPU at and what voltage do you have set in the BIOS for vcore? Anything else OC'd like system bus, NB frequency or HT link?
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post #3 of 28
Thread Starter 
My System runs on 3800 Mhz with 1.425v and is currently only CPU overclocked and "stable" in terms of stability tests. I only get these annoying freezes...
Before I cannot solve this issue there is no use in going further with OC.
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post #4 of 28
What stability test did you run and for how long? Typically I run Prime95 and to ensure max stability, I run for 24 hours. Anything else OC'd such as NB frequency or HT link?
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post #5 of 28
Thread Starter 
Again: only my CPU is OCd.

Playing around with LLC had a few strange effects on my PC: while set on "auto" the computer passes all tests and freezes after quitting them (prime95, 3 hours). With LLC set on 100 % the rig freezes on startup just after the Win7 screen appears. And on 0% it freezes while running a test. (the only thing that makes sense to me *lol)

I see me replacing my MoBo in near future
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post #6 of 28
Definitely a strange issue. You could always try bumping up the NB voltage a notch in the BIOS and see if that helps. Even though my system bus frequency is not over clocked, anything over 3.8GHz for the CPU on my board requires me to up the NB voltage from 1.1v to 1.2v.

EDIT: Just for testing you could also try bumping the CPU voltage up to 1.4v and see if helps stabilize everything in terms of freezing up after stress testing.
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post #7 of 28
Thread Starter 
OK I played around with LLC a bit more: setting this on 0 % boots now, but while testing my CPU now gets REALLY hot, and on 58 °C the multiplier drops to x4 according to CoreTemp and the machine freezes -> heat issue

So using LLC keeps my temp lower, but crashes my machine after testing.

What I try to do now is, go for overclocking with deactivated LLC at MUCH LESS VCore, my bet is that I donÄ't need as much then...
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post #8 of 28
i would try to get an OC without using LLC, because Vdroop has a purpose, to protect your CPU.

the reason you are getting lock ups at different places is because the voltage changes when loading and offloading the CPU, and the voltage either spikes too high or dips too low and the chip is unstable and the PC locks up
    
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post #9 of 28
Quote:
Originally Posted by SoulFlight View Post
OK I played around with LLC a bit more: setting this on 0 % boots now, but while testing my CPU now gets REALLY hot, and on 58 °C the multiplier drops to x4 according to CoreTemp and the machine freezes -> heat issue

So using LLC keeps my temp lower, but crashes my machine after testing.

What I try to do now is, go for overclocking with deactivated LLC at MUCH LESS VCore, my bet is that I donÄ't need as much then...
Do you have cool 'n' quiet enabled in the BIOS? I disabled C1E and cool 'n' quiet in the BIOS, leaving the thermal option enabled. When my CPU was hitting 58-60C the multiplier never dropped.
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post #10 of 28
Thread Starter 
Yep, as far as I remember I turned both off (normally the first thing I do after a reset to default settings).
I had this multi drop problem on my previous ASUS M3N78 EM, except for C n Q and C1E, this seems also be caused by overheating capaciators next to the CPU socket. After adding a Fan pointed on them, I never had that problem.
However, the board was still toast then, so I replaced it with my current one and the fan I added is now still there and directed on the same spot, so I should not really get that issue.
Edited by SoulFlight - 6/8/10 at 12:56pm
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