I currently have an Aquaduct 360 MARK V XT cooling an Asus Rampage IV BE (ICH & VRM), Intel Core™ i7-4930K CPU and two EVGA GEFORCE GTX 780 ti in SLI.
In web-browsing mode the Aquaduct generally keeps up, but in gaming mode it fails majorly. The Aquaduct is rated for around 700 Watts of dissipation.
Looking at the following reviews, slightly dated as they came out when the R9-290 was introduced, the consensus appears to be these cards run hot.
If you plan on 3 or 4 of the cards, you may want to research the subject a bit deeper.
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