Dude, you're contradicting what u said earlier dude.  Dont misguide people. AS5 is conductive and putting AS5 on the mem chips would lead to someting really bad.
To cut the costs of the card's retail price.
Anyway, u can change the gpu core thermal material to AS5 to ensure better heat transfer but leave the gpu mem stock. This way u can crank the gpu speed only rather the gpu mem. If u got the cash, might as well u get evercool cooler from dinster which costs RM40 that gives a full copper cooler with 8 ramsinks for your card which would be a better choice and i think u wouldnt regret spending some cash for it.