Model No.: 03G-P4-3661-KR
My thermal paste is long overdue and the warranty long gone, and my gpu is heating up. I just can't get the damn backplate screws to open. I used generic precision jewelry set screwdrivers and they aren't working. I just need to know the size of the screws to get a precise screwdriver for the job.  

On my EVGA GTX670 FTW
 
size for backplate = PH1  
 
[PH0 - is too Small & you will round the screws]
 
use a quality driver ... cheap ones are too easy to damage