Which video cooling option for my 6800?

[IceMole]

I just got an eVGA 6800 and modded to 16x1 6 and I'd like to lower the 57 idle 65 load temps. Only options I can see are the copper heatsink from eVGA for $19.99 or the Artic VGA Silencer, anyone know which is better? I assume VGA Silencer voids the warrenty but the copper one eVGA sells doesn't? Thanks

 

[thelanx]

I don't know which one is better, you might want to check some reviews online, but I've got a copper GT heatsink that I don't need. If you want it just pm me.

 

[nitromullet]

Based in the temps reported by evga on their site and this review, the NV Silencer is better.