I upgraded my 5,1 earlier in the week with some X5677's. The machine is running fine however ive noticed that the temps are not equal, i can understand 1 or 2 degress difference but earlier i put the machine under some load to test and CPU A got nearly 10 degress C hotter than CPU B. I then physically touched the heatsinks after powering off and sure enough CPU A heatsink was hot where as B was just warm. The only explanation i can come up with is that ive done the thermal paste wrong on A, i did the same pattern on each and thought i used pretty much the same amount. I did the pattern of paste as recommended in apples own technician guide but i must have messed it up. What do you guys normally do with regards to a pattern and amount? Im guessing im going to have to take it apart again and redo it.