Quote Originally Posted by Waterlogged View Post
I don't know what size those holes are but, as long as it can still pass the volume of a 1/2" I.D. tube, does it really matter what shape they are?
I measured and calculated the cross section of the watercool connector a while back, and it comes out to a diameter close 6mm ID tubing, i.e. really bad. If you look at the new Watercool 58x0 block you'll see that the corrs sectionw as greatly increased, I don't think Rico did that just for fun, especially since he's talking about the new block being flow optimized (which tests show it is).

The AC block seems to have a cross section at the connector similar to that of the old Watercool blocks.

That small narrowing of cross section can really make a difference as well, if you look at Cathar's testing [URL="http://www.xtremesystems.org/forums/showthread.php?t=147767"]here[/URL,] you'll see a sizeable difference (close to 10% flow) between push-ins and regular 3/8" barbs, all because the push-ins don't reduce the cross section slightly like the barbs do.

Basically what I'm saying is that it's a shame because it would be so easy to make the cross section bigger and significantly increase flow.