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post #11 of 22
Honestly, if you can hit 4.0Ghz at <1.5v on any Phenom II, it's a better than average chip. I haven't tried OCing one with C&Q enabled, but it's possible that auto-disabling it could be a motherboard specific thing. Even with the CPU OC'd and C&Q disabled, your CPU won't be drawing all that much power when sitting at idle.
 
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post #12 of 22
Quote:
Originally Posted by Reload_X View Post
im currently using my 955 @ 3.7 stable with CnQ enabled. on stock volt

i want a cpu that can do 4.0 like that.... 970?
You might be able to do 4ghz at 1.425. I got to 3.9 on stock and had to raise it to 1.425 for 4ghz 1.475 for 4.1ghz and 1.5 for 4.2ghz. If you have a decent cooler this should not be a problem with this chip. I currently run mine 24/7 @ 4.1ghz.
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post #13 of 22
4ghz with 1.425 you must have golden chip.... you cannot reach 4ghz under 1.45v with deneb phenom's.
    
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post #14 of 22
Quote:
Originally Posted by patricksiglin View Post
You might be able to do 4ghz at 1.425. I got to 3.9 on stock and had to raise it to 1.425 for 4ghz 1.475 for 4.1ghz and 1.5 for 4.2ghz. If you have a decent cooler this should not be a problem with this chip. I currently run mine 24/7 @ 4.1ghz.
Yup. The lack of load line calibration on the Gigabyte FXA ud series, and subsequent voltage fluctuations that result, tell me this:

1.400v @ 4.0ghz is the minimum to get my system to boot.

1.425v @ 4.0ghz will boot into windows, and do things like web browsing. It will not pass prime and it will crash while gaming. At 1.425v, with he lack of LLC on the gigabyte board, I push up to 1.475v while running prime95.

1.450v @ 4.0ghz I can always boot into windows, can run games for a while (will always eventually crash) and cannot pass prime. The max voltage the CPU draws is still 1.475v.

1.475v @ 4.0ghz instead pushes to 1.499v under prime95 load -- and this allows me to pass.

I'm guessing this basically means that I need 1.475 MINIMUM to be stable at 4.0ghz and really should be @ 1.5v.

For this reason I leave my 24/7 oc @ 3.8ghz CPU, 2800mhz NB, 1600mhz RAM. This is stable at just 1.375v and with the....current state...of bulldozer it looks like I'll be keeping my 1100T for awhile and not upgrading til the FINAL revision of the FINAL AM3+ compatible CPU is released.
    
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post #15 of 22
Quote:
Originally Posted by yuksel911 View Post
4ghz with 1.425 you must have golden chip.... you cannot reach 4ghz under 1.45v with deneb phenom's.
Nah my Thuban is the same. The 4.0ghz mark seems like it's really a stretch for most of them. If I had a real cooling setup it wouldn't be an issue.

If I disable 2 cores I can hit 4.3ghz @ just 1.425v. The performance like this, vs 6 cores at 3.8ghz seems to be far worse.

3.8ghz - 6 cores enabled: 71-73gflops linpack

4.3ghz - 4 cores enabled: 48-52gflops linpack.

Disabling 2 cores also drops my temps by 10-15c across the board under load. Too bad it performs so poorly.
    
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post #16 of 22
Thread Starter 
well im going to try 4.0 @ 1.5 and see how it turns..........

plz guys i need some advices for NB overcloocking???



edit: mmmm idont know if i need to try prime 95 but idle temp is 51c with a ambient of 28c this is hot!
Edited by Reload_X - 10/19/11 at 10:06pm
post #17 of 22
if your idle is 51c..scrap that idea!
 
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post #18 of 22
Quote:
Originally Posted by Schmuckley View Post
if your idle is 51c..scrap that idea!
Heh i tried 1.5 volts4ghz last night actually to see if it would stablize my OC I didn't idle that high thank god only 38-40C but after a long while i BSOD. Im using 1.4V 3.8 stable on my chip now. For OP All phenoms are decent chips I would suggest the 955 best value and possible capabilities.
Edited by Chiefpuff420 - 10/20/11 at 2:17am
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post #19 of 22
Quote:
Originally Posted by Segovax View Post
I don't know if any Phenom II can do 4.0 on stock volts. That would be unusual. A golden chip if there ever was one.
I managed it just fine. I think my CPU-Z link in my sig can prove it.

EDIT: Sort of, it's when I lock two of the cores. I did get it to 4GHz at stock voltage on 4 cores and it was stable.
    
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post #20 of 22
for nb overclocking..set your cpu/nb voltage to 1.26-1.375 ..then raise you cpu/nb frequency up a notch at a time til computer doesn't POST..then lower it back down a notch or two
 
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