need help getting Q6600 stable at 3.4ghz

[gplracer]

My comptuer seems stable but prime crashes somewhere in the middle of the night after 4 our more hours. I tried 1.26v and 1.34v.

 

[clarkey01]

Hmm 1.29 gets me 3Ghz stable for 4 hours with 4 instances.

Latest bios?

What temps at full load?

Mine hit 52C max.

 

[PliotronX]

I have the same board and a Q6600, VDroops like a mother. Q6600's vary in their voltage requirements, but mine needs +137.5mv in the BIOS to be Prime and Linpack stable at 3400MHz. In CPU-Z during Prime this shows 1.376v.

edit- fixt mv figure

 

[gplracer]

Wow that is some vdroop! Someone suggested some more vtt and i noticed my ram is at 1.95v. The recommended amount of voltage for the ram is 2.00-2.1v

 

[GundamF91]

I've noticed that vDroop is a big issue if you want stable system. Unless your board has a scheme that compensates it, such as Load Line Calilberation that Asus uses, then you would have to up your vCore until its lower limit under 100% load is high enough for stable operation. Basically you just have to keep upping vCore until it's stable. There's really nothing else to it.

 

[clarkey01]

Originally posted by: PliotronX
I have the same board and a Q6600, VDroops like a mother. Q6600's vary in their voltage requirements, but mine needs +137.5mv in the BIOS to be Prime and Linpack stable at 3400MHz. In CPU-Z during Prime this shows 1.376v.

edit- fixt mv figure

Have you ran memtest on the ram?

 

[PliotronX]

Originally posted by: clarkey01

Originally posted by: PliotronX
I have the same board and a Q6600, VDroops like a mother. Q6600's vary in their voltage requirements, but mine needs +137.5mv in the BIOS to be Prime and Linpack stable at 3400MHz. In CPU-Z during Prime this shows 1.376v.

edit- fixt mv figure

Have you ran memtest on the ram?

Aye, 200+% coverage no errors.

 

[clarkey01]

drop down to 3.2 and be happy with it

200 Mhz wont stop you upgrading and an 800 Mhz overclock isnt bad.

 

[gplracer]

Well.... 3.2ghz is prime stable for 12 hours. I tried upping the cpu vtt and the blue screen of death came up. Maybe I should try again at 3.3ghz. I have not run memtest on the ram. That would be a smart option. I upped the ram to 2.0v since the is the recommended amount.

 

[clarkey01]

Originally posted by: gplracer
Well.... 3.2ghz is prime stable for 12 hours. I tried upping the cpu vtt and the blue screen of death came up. Maybe I should try again at 3.3ghz. I have not run memtest on the ram. That would be a smart option. I upped the ram to 2.0v since the is the recommended amount.

I find my ram to be the limiting factor in my OC so it wouldn't surprise me

 

[gplracer]

Update: I am now 13 hours prime stable at 3.3ghz. I am really happy.