**** WARNING / IMPORTANT NOTE ****

If you use the NF4 EK block on your SB and don't watercool your gfx card, you will find that you can only use the bottom SLI slot, and it requires mounting the block in the opposite orientation to the picture above.

I'm also not a fan of this block at all. The mounting mechanism is crap as you have to tighten it on from behind the motherboard. This means you have to dismount the whole mobo unless you have a tray with a cutout round the back. VERY painful when prototyping stuff up etc.

One further issue that I'm wrestling with is the fact that as water leaves the hose from this block, it has a stream of airbubbles in it. Not sure its the block, but they don't appear in other sections...