Asus i7 8phase vs 16phase CPU power?

[kup]

My D0 920 overclocks like crap on my P6T-SE, needing 1.35v for 4GHz and not coping with ANYTHING higher. I don't have the batch to hand but it's a very late 08 A chip. I've seen so many D0 chips needing so much less for 4GHz. is this down to the lacking power capabilities on the P6T-SE, and would a a 16phase model make a big difference or are some of the D0's just bad clockers?

It's air cooled with a TRUE with a push/pull setup. The ram is good for more than it's at and the power supply is a Toughpower 850.

[NaeKuh]

is your load line calibration on?

1.35v after vdroop or b4 vdroop i what im trying to ask.

[kup]

LLC is enabled. 1.35v is after droop.

[Nanometer]

other voltages? bclck? use lowest voltages for nothbridge and qpi then try again with lower vcore. you should need a tenth less then that to reach 4ghz.. unless you have a poor chip

[jcool]

Try another mult? I am assuming you run with 20x right? IIRC the P6T doesn't properly disable the TDP and current limits for Turbo mode, so 21x is probably not an option... 19x maybe? If that mobo can even do >200 BCLK, my P6T couldn't.

[Arthur]

Every CPU need to use more voltage value under overclocking when you running it in the air. You can consider it but there may be other problems with your setup or settings as well.

Cheers,
Arthur

[kup]

Try another mult? I am assuming you run with 20x right? IIRC the P6T doesn't properly disable the TDP and current limits for Turbo mode, so 21x is probably not an option... 19x maybe? If that mobo can even do >200 BCLK, my P6T couldn't.
This P6T-SE can do upwards of 215BCLK 100% stable (LinX, Prime, encoding 1080p video...), it's about the only good thing about it.

Are there any fixes to the TDP and current limit bug on the P6T-SE yet?

My other voltages are all the default bios options, not AUTO but whatever the bios specifies as "stock". QPI has gone to 1.45v and it made no difference. One this is that this ram doesn't like anymore than 1.5v (instant instability) but can go all the way to 1800MHz stable (Memtest, LinX, Prime...) with only the 1.5v.

20x200 is unstable no matter what. 21x191 is rock solid. 19x211 is rock solid. I read here in another 920 thread that someone needed 1.4v for 4GHz with 20x but only ~1.26v(IIRC) with 21x, I tried this but only got it down to 1.3v with 21x and only stable for about 10mins before it would lock (previous 20x and 1.3v was instant lock).

[Sam_oslo]

Vcore is more dependent on CPU-batch than the MB. My good old i7 920 C0(B-batch) needed 1.34v for @4GHZ(19x211), but my w3250 runs at the same speed with only 1.15v on the same setup (same MB, RAM ..).

My Both CPUs requires less Vcore for 19x211 than 200x20, but the difference is not as much as above.

Your Vcore is too high for a D0, unless you got a really bad batch, but other stuff ( specially RAM and QPI) can be the problem too. You can try to focus on CPU first by loosing up the RAM timings and run Prime95 small FFT to see how much Vcore you need first, and adjust your RAM later.

[eva2000]

Yeah my i7 920 d0 3851A368 cpus need 1.312-1.328v for 4ghz but they still clock nicle with HT enabled for 4400mhz 3d benching and 4677mhz 4 core 2D benching and 4700+ validation on water cooling with 230-235bclk headroom and still run cool. You have low vcore high temp cpus or like mine higher vcore but lower temp cpus :)

[kup]

Vcore is more dependent on CPU-batch than the MB. My good old i7 920 C0(B-batch) needed 1.34v for @4GHZ(19x211), but my w3250 runs at the same speed with only 1.15v on the same setup (same MB, RAM ..).

My Both CPUs requires less Vcore for 19x211 than 200x20, but the difference is not as much as above.

Your Vcore is too high for a D0, unless you got a really bad batch, but other stuff ( specially RAM and QPI) can be the problem too. You can try to focus on CPU first by loosing up the RAM timings and run Prime95 small FFT to see how much Vcore you need first, and adjust your RAM later.
What would be an ideal voltage for QPI?

For an average D0, what would you set for 4GHz?

Multi:
BCLK:
VDIMM:
QPI:
PLL:
IOH:
IOH PCIE:
ICH:
ICH PCIE:

I've always thought this D0 has more potential because it's not even that hot running. 1.35v 4GHz LinX x64 @ 80*c load for hours. And this is in a proper hot room atm...

Any other ideas as to what it could be?

[kup]

Tiny update, tried 1.3v vCore, 1.35v vQPI and I managed about 15mins longer in Prime95 x64 SmallFFTs. This was with 19x211.

[kup]

Bump... Any other thoughts/opinions?

[PatRaceTin]

my R2E is very rock solid Vcore no droop