vcore

Banny

Banny

Banny

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Is 1.42v vcore under load a little to much.
Just testing this Q9650 have it at 4.2ghz, but needs a lot of volts to get there.
Got it a 1.5v in bios (1.46v idle 1.42v load CPU-Z) 1.4 vtt, should be able to bring that down abit and 1.71v NB, hoping to get that down too.
Its just a question of what do I lower first.
Still cant complain at 4.2ghz out of a CPU with a VID of 1.3v.
Doing some tests now, nearly finished an hour of OCCT, which I know if it pass's that my rig is stable.
Probably wont run at 4.2ghz will back it down to 4ghz with the lowest volts as these Q9650s seem to like high volts at high MHZ.
 
I have no idea about 45nm, but I've heard that too high a VTT can kill them, don't know what "high" is though. 1.71v on the NB is very high, I presume your watercooling your board and keeping an eye on NB temps?
 
For dual core C2Ds I would say keeping below 1.45V is a decent limit, but with twice the cores I dunno how much higher you can go. The VID on my E8400 is 1.15V which gives 0.3V to play with...
 
Getting it down now to more sensible limits.
not much budging on vcore though, 1.41v underload
1.63v NB, 1.34 VTT, 1.54 PLL so slowly working my way down on the other settings.
Yeah I am on decent water, have nothing to check NB temps but should be OK
Max cpu after an hour is 61/58/61/60, but most of the time they are hovering around 55c.
This is at 4.2ghz not 4ghz.
So seem to be doing OK with a very high VID chip.
 
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I take comfort from this actually. My q9550 definitely loves voltage. So far I've kept carefully below the Intel recommended maximum value, but this suggests I could take it higher without immediate destruction.

I'd have said 1.42 is a fair bit too high, but I might be trying the same in the near future


edit: 1.6 on the northbridge would scare me more, is that underwater at least?
 
edit: 1.6 on the northbridge would scare me more, is that underwater at least?[/QUOTE]

Mine is X38 so 90nm where as yours is P45 so lower nm 1.65 would be to much for yours, but not my chipset.
Have used 1.75v before for 480 fsb on my old Q9300.
Got my VTT down to 1.34v now and PLL to 1.54v NB 1.65v wont work any lower just crashs out after awhile.
Thats 4.2ghz out of the way, now to try for 4.3 think I will be lucky though, seem to be on the edge now but you never know.
Then get a nice 4ghz overclock for everyday use.
 
My board is actually x48 and I believe either 90nm or 65nm tech, believe its 65nm but as its speed binned x38 then more than likely 90nm

doing 490fsb so needs it, any lower will crash, even 450fsb needs 1.5v on nb, its also under water as well so no worries there ;)

Good luck with your clocking
 
Yeah its good fun Pauly.
You have a great combo there, no way this P5E will hit 490 fsb.
Quick question testing now at 4ghz, still need quite high vcore 1.34 load 1.32 failed. Have dropped NB to 1.41v, PLL 1.5v stock, VTT 1.26 and pass's OCCT fine.
Now testing with VTT at 1.22v see if it pass's
Does increasing the VTT higher enable you to lower vcore, doesn't seem to, but worth asking.
Temps are great at 4ghz under 50c OCCT load would be more using IBT I expect, still very happy with this CPU considering the 1.3v VID.
Will edit this if I get stable at 1.22 VTT (would be nice to get 1.2v stock). will probably work the NB volts to a little lower if I can aswell.
 
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