P45T-extreme + q9550..... again :)

[Chike]

Re: P45T-extreme + q9550..... again :)

anyway on the refs i'm a little confused:-
set vtt mobo stock
set refs mobo stock
then up vtt ???

is that right so when i change vtt the refs change but stay within x%?

Precisly. Some motherboards has it as percent so you don't need to change VTT to know what you are doing.

[Lsdmeasap]

Re: P45T-extreme + q9550..... again :)

0x00000124 means more Vtt, but that could be skewed by your changing of the ref values.

If you are not over 450-500 FSB you should need to adjust CPU ref's

[Neoroy]

Re: P45T-extreme + q9550..... again :)

Wow thx Acebmixer and lsdmeasap, now i know the problem if comes BSOD :)

[Ben_charm]

Re: P45T-extreme + q9550..... again :)

I keep having issues with memory speeds while oc'ing this board, is there something magical about the 1600mhz memory speed? Is it the point that sends too much info down the bus and it cries enough?

[Lsdmeasap]

Re: P45T-extreme + q9550..... again :)

It could be, or it could be the memory itself.

[Ben_charm]

Re: P45T-extreme + q9550..... again :)

well i got a 495fsb to boot and run 3dmark but bsod 124 (vtt) straightaway with IBT

settings used in bios were:-

495 @ 8.5 4200

vcore @ 1.4
vtt @ 1.36
Pll @ 1.58
ref1 @ .82
ref2 @ .86
mch @ 1.36

mem all auto with 2.66D @ 1.66V

[Lsdmeasap]

Re: P45T-extreme + q9550..... again :)

Give it more Vtt then :)

[Ben_charm]

Re: P45T-extreme + q9550..... again :)

Limiting my vcore at 1.36 in windows
Benched vantage and 3dmark06 at 500fsb O_o 22839 3dmarks

fastest i can get without going over
vcore 1.36 in windows ( 1.406 in bios )
vtt 1.4
pll 1.58
mch 1.4

4.25 500fsb

3DMark Score 22893 3DMarks
SM 2.0 Score 8969
SM 3.0 Score 11020
CPU Score 6210

vantage
3DMark Score P17821 3DMarks
CPU Score 16724
Graphics Score 18219

thanks guys :) i can stop playing with the q9550 and wait for the qx9650 i get in a couple of weeks hehe

[Neoroy]

Re: P45T-extreme + q9550..... again :)

wow nice cpu score ben_charm :) i only tested 3dmark2006 at 4ghz fsb 471 with myrig got 21.5xx total score, cpu score is like 5.8xx (fsb 475 cpu score=5.9xx) ^_^

[Ben_charm]

Re: P45T-extreme + q9550..... again :)

Thanks neoroy, I have been going over it in my head and it is harder to let go than I thought, I still have about 10degrees in the bag but pretty much bang on recommended voltage limits :(

Also just found out the qx9650 runs 35watts more with 5/6 degrees less tcase .... Hmmm

[Acebmxer]

Re: P45T-extreme + q9550..... again :)

Maybe Psycho or chike or lsd can correct me if I am wrong but vtt has to be 0.5v under vcore or problems could arise.

This could not be the case with ddr3 memory on a p45 board.

[Neoroy]

Re: P45T-extreme + q9550..... again :)

Maybe Psycho or chike or lsd can correct me if I am wrong but vtt has to be 0.5v under vcore or problems could arise.

This could not be the case with ddr3 memory on a p45 board.

So if i use vcore 1.3volt then vtt should 0.5v under it which is 1.3 - 0.5 = 0.8v?? sorry if i mistake ^^ or u mean 0.05v?

[Chike]

Re: P45T-extreme + q9550..... again :)

I don't think it's a problem to have the VTT above vcore, it just mean you may need even highr VTT to stabilize the FSB signal.
You can read about the effects of vcore on AGTL+ in Understanding GTL Reference Voltage

[Lsdmeasap]

Re: P45T-extreme + q9550..... again :)

Ya, it's generally noted that is needs to be under by at least .05, especially on older CPU's (65nm)

I think it's ok on 45nm, maybe close to vcore is ok, I just personally wouldn't use too much more than Vcore

[Neoroy]

Re: P45T-extreme + q9550..... again :)

Ya, it's generally noted that is needs to be under by at least .05, especially on older CPU's (65nm)

I think it's ok on 45nm, maybe close to vcore is ok, I just personally wouldn't use too much more than Vcore

Thx lsdmeasap :) i will note that.