take your gpu out, take off the zalman, go get a puffsie
(little puff balls) and gets some Alcohol, put the puffsie on the cap, give it a up n down, take it out, completley clean out all the zalman TIM you used.
Now get your as5...put a TINY TINY TINY dot on the chip..then get a plastic bag, put your finger in it, and rub the thermal paste all over, but be carefull not to get it over the sides....
Only do it on the chip, leave the heatsink clean and your good..
Also where did you apply the thermal paste...
3 things could have happend:
1. You didnt remove the old paste, cuasing too much, therefore defeating the purpose.
2. You put the zalman stuff on the heatsink, and chip.
3. You put it on both with both the stock paste on.