Tweaktown tests four ATI Radeon HD 4850 Cards in one single system.

Quote from the review: "The guys down at IBuyPower Australia can’t get rid of me these days. I’m surprised they haven’t started asking me to pay rent. The other day the ASUS P5E64 WS Evolution board arrived, and this thing just absolutely won me over as far as looks and features went. However, the feature that we really care about today is the fact it has four PCI Express x16 slots. While ASUS use a x16/x16/x4/x4 configuration, it’s really one of the best on the market. So, with four HD 4850s in hand and hopefully a driver that was going to work, it was time to take four of these single slot bad boys to town."
Read the full review on Tweaktown.