Quote Originally Posted by NicePants42 View Post
The general consensus is that since C2D IHS's are bowed, a bowed water block will have better contact and thus lower temps. I've seen a few reports that a bowed GTX is better than flat, etc. and I would have to assume that this is true since both the Apogee GTX and Fusion are bowed by Swiftech and D-Tek, respectively. If you purchased your block(s) recently, (like, after July) they are bowed.
The general consensus you speak of is not true. It makes no difference if the IHS is flat or less flat, bowed will perform better due to better mount pressure over the die(s).