voltage required for 4.0 & 4.2Ghz on a D0 920

Arachnae · 30 Sep 2009 at 16:22

Hi guys, just wondering what sort of voltages you guys are needing to use for a stable 4.0Ghz and 4.2Ghz?

Also, another question, does the bclk and multiplier have any effect on the voltage required if the result is the same? E.g. 191x21 vs 200x20?

oggiet · 30 Sep 2009 at 16:27

Depends on the chip mate. If you using turbo it normaly needs a bit more volts but less uncore

DeadMan · 30 Sep 2009 at 16:41

I use 1.26v at 191x21 to get 4009mhz with HT and VT on.

prt · 30 Sep 2009 at 20:17

I use 1.23v at 191x21 to get 4009mhz with HT and VT on stable enough aswell

JonJ678 · 30 Sep 2009 at 21:11

1.28V on windows desktop, 200x20, hyperthreading on, turbo off. Probably stable but not very tested yet.

200x20 tends to need more voltage than 191x21.

surge · 30 Sep 2009 at 22:36

1.26 idle/1.25 full load for 4.2 GHz OCCT stable, 20x200 HT on, turbo on

DavyBoy · 30 Sep 2009 at 23:04

1.248v (20x200) for 4GHz, and 1.296v for 4.2GHz.

Arachnae · 1 Oct 2009 at 06:28

I see, im currently at just over 1.3V, seems a little high compared to you guys.. i wonder if i can drop it down without bsods

Arachnae · 6 Oct 2009 at 00:58

Hmm perhaps im missing something...

I've set my my qpi voltage, pll and my clock skew at 1.65, 900mv and 100ps respectively, but to hit 200x20 im needing to push my cpu voltage up to over 1.3 to get into windows and im still getting bsods in prime at over 1.35v.

any ideas?

JonJ678 · 6 Oct 2009 at 01:01

If you're actually pushing 1.65V qpi its important that you stop doing so, that's about 0.3V too high. I think that's in the region where xs discovered processors dying after a couple of days.

Arachnae · 6 Oct 2009 at 01:02

Hmmm this is what the XMP settings pushed it to, i may be mistaken and its 1.35qpi though.. probably is 1.35 come to think of it.. and ive mixed myself up with dram voltage which is 1.66

rjk · 6 Oct 2009 at 08:29

whack in 1.325 then work down
simple

BigBruiserAl · 6 Oct 2009 at 08:59

I can do 4ghz on 1.285v but 4.2ghz needs 1.38v poor chip but stable as a rock so far

Arachnae · 6 Oct 2009 at 09:30

rjkoneill said:
whack in 1.325 then work down
simple

I'm not stable at 1.35 vcore though, so im not sure 1.325 will help

SABRE70 · 7 Oct 2009 at 08:55

1.24375 for 20x200 in my xeon w3520 linx stable

Arachnae · 7 Oct 2009 at 10:53

I guess I've got a weak chip then

Which is strange since I could run 3.4Ghz safely at 1.15V.. cpuz reports 2.6ghz at 1.224V in contrast..

Maybe I'm missing something, or not hitting the right setting, any ideas?

Also, what does PLL voltage actually do?