Undervolting my Phenom II 955

farlex85 · Aug 10, 2009

I generally try to undervolt and overclock simultaneously if possible. I'm sure it's a bit different on the intel side though, I haven't dabbled in PII so I can't fully relate. I OC'd my Q9550 to 3.65ghz though (from 2.83) and undervolted to about 1.2v (1.26 VID I think) and it was stable, but my mb doesn't like to restart properly if it's not happy, so I bumped it up to 1.22 or so. I leave on all the throttling, so that goes as low as 1.15 and really on account of vdroop doesn't go any higher than 1.19v or so.

To me undervolting isn't really worth it unless you can get some extra clock out of it too.

hippie · Aug 10, 2009

Impressive!

Thats a nice over clock you have going there, with the lower volts. Wish my 940 could pull 1.18v@3.6ghz

farlex85 · Aug 10, 2009

hippie said:
Thats a nice over clock you have going there, with the lower volts. Wish my 940 could pull 1.18v@3.6ghz

Thanks, I wish I could test it further, cuz I'd wager it could go a bit higher w/ a bit less volts than VID, unfortunately my board doesn't let me push the FSB for this thing much higher. :ohwell:

mudkip · Aug 10, 2009

erfwrf4

rake · Aug 10, 2009

Pyrofeed said:
Is there anything else I can do to increase stability?

I mean if they got lower, I'm sure there is something I'm not doing right. I know all chips are different, but I'm sure I can get closer

Ah yes, something I completely neglected to mention: ACC (Advanced Clock Calibration). Be sure to enable it in your BIOS. While AMD have been very tight lipped about how exactly ACC works, it has been proven (by Anandtech and others) that it improves OC ability for Phenom processors, moreso if you happen to be stuck with a bad apple.

Supposedly it can help with undervolting as well.

Just set it to 'AUTO' for now. Later on, if it turns out that you have one wonky core, you can mess about with individual settings. (I'm still experimenting with those)

Pyrofeed · Sep 1, 2009

I'll check it out, I don't know how much lower I can really go, I'm happy with 2.625 but I would like lower

Velvet Wafer · Sep 2, 2009

hippie said:
Thats a nice over clock you have going there, with the lower volts. Wish my 940 could pull 1.18v@3.6ghz

my 955 did 3.2 at 1.2. not too bad ;-)

Pyrofeed · Sep 12, 2009

So the ACC seems to help, I can not for the life of me find an explanation as to why, but its doing the job. I'm steadily dropping, I'll post back when I find a new low

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Undervolting my Phenom II 955

farlex85

hippie

farlex85

mudkip

rake

Pyrofeed

New Member

Velvet Wafer

Pyrofeed

New Member

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