I've just built a system specifically for using rift but I thought i would try it on my old system first which is Gigabyte GA990 FXA - AMD FX8350 4.0 CPU - 32Gb Ballistix ram - Sapphire Radeon 7950 3gb graphics.
Now although this is quite a powerful system it does not meet the minimum requirements for rift.
But to my suprise the damn thing worked and worked very well, what also surprised me was it says on the box that rift requires 3 x 3.0 USB ports and 1 x 2.0 USB port but there are only 3 USB connectors on the rift and sensors which are all USB 3 types.
Also setup failed when i used my USB 3 ports but it all came to life when I used USB 2 ports.
I was wondering if anyone had any ideas regarding these strange things.