I think it was talking the fastest of the Sata6 SSDs, the OCZ model.
"The RevoDrive 3 X2's performance shouldn't be surprising. In fact, you should be able to get similar performance out of a 4-drive RAID-0 array of Vertex 3s. Unfortunately you wouldn't be able to do so on a 6-series Intel motherboard as you're limited to two 6Gbps SATA ports. You'd either need to invest in a 4-port 6Gbps SATA RAID card like this or look at AMD's 8/9-series chipset, which does make the RevoDrive 3 X2 a little more attractive."
The thing about the Revo3 isn't that it's PCIe. It's that it's all integrated into 1 "drive" -- the RAID is built in. No need to RAID in multiple drives. Easy to use and set up. I've never done RAID before but it was seamless to put in my Revo x2 100GB on my new system several months back. Takes less power, less cables, less storage space than putting in a RAID of separate drives.
That's just icing on the cake, putting it all in 1 package. The performance really blows away the OCZ in many of the tests. The sustained tests showed the OCZ topped out about 500-550 MB/S whereas the Revo3 x2 trippled that. I'm not sure about the scalability of RAID 0, but I don't think you get tripple the performance. Maybe double? Still overall very interesting.