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Undervolting an Opteron 165

post #1 of 6
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On a TForce-6100 board, my voltage for the past week has been 1.15V (CCBBE 0616 stepping). It has a small overclock, ~225mHz (feels wrong to post in here running a rig w/ no oc!); I'm curious how low it'll go. Anyone here have an interesting skt.939 underclocking story?
post #2 of 6
I can't undervolt in the BIOS, but CrystalCPUID lets me soft-undervolt in windows. I can go as low as 1.1v with the stock clock on my Opteron 170(2.0ghz). At 1.15V I can clock to 2.2ghz. I haven't tested the stability at the same vcore any higher. The only reason I'm doing this now is that I have to pay a power bill, and while I'd love to fold at 2.8ghz, the power draw from my system jumps to 210+W. Undervolted and Folding I only draw 124W with 2.2ghz and 1.15v. If I assume my power supply is actually being efficient at this load level, lets say 80%, the actual DC draw of my system is only ~99W.
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mitx
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post #3 of 6
Quote:
Originally Posted by scooba View Post
On a TForce-6100 board, my voltage for the past week has been 1.15V (CCBBE 0616 stepping). It has a small overclock, ~225mHz (feels wrong to post in here running a rig w/ no oc!); I'm curious how low it'll go. Anyone here have an interesting skt.939 underclocking story?
Before my gaming rig's motherboard (Asus A8N32-SLI Deluxe) went belly-up with a chipset failure, it ran my Opteron 170 at 2.8GHz on 1.30V VCore. It was absolutely stable, too. Tested 13.5+ hours on Orthos (test terminated only because I wanted to use the rig!); my guess is the CPU probably could have gone for longer too, had I not been impatient.
    
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post #4 of 6
Are you sure this is not "cool n' quiet" reducing the voltage? What happens if you disable it in the bios?
post #5 of 6
Opty 170 @ 3.0 1.35 vcore (yes its stock vcore) 12 hours stable orthos, 3+days folding stable. Would have tested orthos longer, but folding proved it for me, just used orthos as proof.
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post #6 of 6
0.925v @ 1160MHz
1.150v @ 2360MHz
1.300v @ 2900MHz

1.25v gets me to about 2.85GHz, these are just a few of the undervolting steps I've tried I use CrystalCPUID to switch automatically between the top 3 settings (multiplier changes from 4 to 8 to 10) depending on load.
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My System
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Maxtor Diamondmax 10 250GB NEC 3540A Windows XP Pro SP2 Dell P1130 
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$10 Logitech Seasonic SS-550HT Antec P160 Logitech MX518 
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