oh and this is the reply I got back from Water Cool about water block compatibility.
Water Cool said:Hello,
the ASUS Direct CU II series (DC2) uses always a custom layout. Reference as our Heatkiller GPU-X³ GTX 680 blocks will not fit here.
If you are searching for a 4GB reference card, you can choose one of those cards:
Club 3D GeForce GTX 680, 4GB GDDR5, 2x DVI, HDMI, DisplayPort (CGNX-X688)
EVGA GeForce GTX 680, 4GB GDDR5, 2x DVI, HDMI, DisplayPort (04G-P4-2686)
Gainward GeForce GTX 680 Phantom, 4GB GDDR5, 2x DVI, HDMI, DisplayPort (2524) EAN 4260183362524
Palit GeForce GTX 680 JetStream, 4GB GDDR5, 2x DVI, HDMI, DisplayPort (NE5X680010G2J-1040J)
Zotac GeForce GTX 680, 4GB GDDR5, 2x DVI, HDMI, DisplayPort (ZT-60103-10P)
I highly recommend EVGA because of there warranty policy. You will not lose your warranty by installing a third party block. You can read it here. http://www.evga.com/support/faq/?f=57720
Mit freundlichen Grüßen / Best regards,
Christian Bernhard
Sales & Marketing
Watercool e.K.
Zum Mevenbruch 6
D-17192 Waren-Warenshof
Germany
Tel. 03991-1822980
Fax. 03991-187602
http://www.watercool.de