Originally Posted by Janac
I am using Cermique 2 thermal paste.
But if i remove cooling, so there is just a naked PCB it also wont boot up? Whats that man?
The card cant reach 90°C in one second...
If I understand you properly, you have installed the heatsink and fan and it boots. When you remove them and put on water - no boot. Then when you put on heatsink and fan it then boots.
I know there is a thermal switch on these cards that will cut them off if a threshold is reached. I can understand your dismay if it hits this thermal threshold in a millisecond on boot. Yet, I have no other explanation.
Open the case, turn-on the strongest house fan you got and aim it directly at the card. Then try the boot with water and see how far it goes.
Your situation is alarming for those of us who are about to watercool.
NOTE #1: I know your waterblock is an old design. Maybe there is something going on with the mount and the gpu is thermally compromised. I am reaching for an explanation with this one. The shim suggestion is a good one - EK has a copper shim for $5.
NOTE #2: I just looked again at the Myst heatsink contact point with the gpu. It is not indented in any way but flat as a board. This means the gpu must be at the same level as the surrounding platform base - because the heatsink contact is so wide, it contacts this base along with the gpu. My gpu had a very, very thin layer of TIM covering the entire surface; i.e. it was applied properly. So, for most of us, we should not have to use a shim like the EK shim which was designed for 7950 and 7970 gpus..Edited by Bluesman - 4/8/13 at 3:29pm