thermaltape is very thin .
its used to stick small ramsinks onto the chips .
thermal pad is used just for heat transfer .
no sticking power at all i guess .
but which one better, that im not sure .
i think thermal tape lorh cause its almost like direct connection between chip and ramsink .

anyway, using ramsink wont reduce much for vRAM .
normally for vRAM its either stock cooler or waterblock is a better choice .
ramsink will not improve much for it .
heck some of them even make the temp shoot higher >.<"