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EK's 680 GTX waterblock covers most of the 2gbs and only one 4gb card, the zotac 4gb. The palit and gainward 4gb cards don't seem to be on their compatibility list so I going to hold out for this Zotac one.
It's due in with another e-tailer, I'm keeping my eye on OcUK to see if it comes in here.
The part number on EK's site for the 4gb zotac is ZT-60103-10P
will probably grab one (for now) of these when they come in
You won't see any improvement over the 480sli with 1 680 by the way just incase you think you might, I guess you are doing it for the vram though like I did.

