Do certain types of waterblocks prevent crossfire? Last Question, Ordering in 6 hrs!

[CrewXp]

Hey, I have a 4870, and I need a waterblock for it. But I've read that some are bigger than others and dont allow crossfire. 2 Questions that are hopefully answered before I order, so I dont make the wrong decision.

1.) Will any of these cards not let me do crossfire? Which is the worst one?

2.) Also.. I'm guessing all 3 blocks will take up the pci-e slot next to my card, right?

I'm debating between a...

MCW60-4870
http://www.crazypc.com/products/mcw60-4870-9366.html
--------------------------------------------------------------------
Heatkiller Gpu-X2 4870
http://www.performance-pcs.com/catal...ducts_id=25222
--------------------------------------------------------------------
and a EK-FC4870 (EK Radeon Water Block for 4870)
http://www.frozencpu.com/products/7881/

Thanks A LOT!! Once I buy this, I can complete my new i7 setup! Cant wait!

[TopFuel1471]

Full cover does look a bit more clean, but you can do it with GPU block too.

You get to use cool sli fittings if you go with the HK or EK FC blocks.

[cx-ray]

Water blocks are almost always flatter than the stock cooler. You shouldn't have a space prob with a Crossfire capable board. From the blocks you listed it looks like the EK and HK are the most convenient to set up due to the connector hole alignment.

[Razrback16]

You can do Crossfire with any of those. If you use a GPU only block, you have to bend the tubing, but Viper John sells custom bent tubing that doesn't kink -- I don't have the link to his site here on my work computer, but do a search for Viper John on Yahoo/Google and contact him via e-mail. If you go with full-coverage blocks, either get the direct connect nozzles for the blocks or just squeeze in a piece of tubing that directly connects them together (this is what I did rather than pay extra for special fittings).

[3Z3VH]

You can absolutely do pretty SLI fittings, even if you have non-FC blocks.

I really need to take some better pics of my new main computer.... the best pic I have of it is this one:
(Don't mind the messy cabling et all... this was while I was leak-testing)