[Witchdoctor]

Sub zero I don't think it wioll matter what paste you use I use What ever I have on hand for mine .... have not really noticed any difference personally.

It may be a tuning issue. As if it was dialed oin for older cards it certaily won't be ideal for these new beasts.

I would throw it on an older card to see what happens ......

May just need a metering or refrigerant optimization