Unstable oc with new HSF

lee87 · 28 Mar 2006 at 20:36

Hi, I got a new HSF (Thermaltake blue orb II) to replace the stock one on my X2 3800+. The temps are now lower but not great - 50c load. If I overclock the cpu to anything over 2.5 ghz it is unstable. I could get it to 2.65ghz using the stock hsf and this was with higher temps (59c). :confused:

Does anyone know why I can't overclock now that the temps are lower with my new hsf.

Thanks

Shiz · 28 Mar 2006 at 20:43

Try reseating the new HSF and make sure you use some AS5. You will probably find its just not sitting quite right and that although the temps are lower at idle they are peaking higher under load due to improper contact.

lee87 · 28 Mar 2006 at 20:54

I used some AS5 but I didn't clean the cpu as I didn't know what to clean it with. Would this make a difference?
The temps are lower at both idle and load. I'll try reseating the HSF tomorrow.

decto · 29 Mar 2006 at 16:47

If you left the old gunk on the core then applies AS5 then this would cause this type of issue. The paste needs to be squashed to a very thin film allowing metal to metal contact where possible with the paste filling in any microscopic gaps.
A little goes a long way

Regards

AD

lee87 · 29 Mar 2006 at 17:26

I've just removed the old paste and put some AS5 on and the temps have gone down a bit. I've tried to overclock again and I can get it to 2.63ghz

.
This was about the same oc I got with my stock heatsink.
Any higher and it doesn't even get past the post screen. This must be the limit for my cpu.

Thanks for the help