Also, previously it was mentioned that you would need two of those SLI fittings if you wanted to have 2 cards in parallel, as opposed to having them in series.
Basically, most people just have their cards in series, but some prefer to have them in a parallel connection. There is endless debate as to the pros / cons of either configuration.
Basically put, in series 100% of your flow passes through each GPU block, and in parallel ~50% of the flow passes through each GPU block. A parallel connection offers less restriction (higher flow rate). Many argue one or the other works better but I believe the difference is usually found to be pretty minimal either way unless perhaps if you already had issues with a low flow rate.Edited by Unicr0nhunter - 9/30/13 at 7:38pm