I wrote Ocean Rift. The problem is it runs at 100+ fps on my modest machine (580 GTX), and all the others I've tested it on. For some reason in runs really poorly on other (much faster) machines, never have quite figured out why. I suspect it has something to do with the complex water surface, although even that is based on a stock Unity Pro asset.
It looks like he's running crossfire.. until amd/nvidia provide drivers we've been warn to stay away. or disable sli/crossfire when using oculus
https://developer.oculusvr.com/forums/viewtopic.php?f=34&t=6738