It depends on amperage on the 12V rail. For example, if I'm correct for an 8800GT one would need 22 Amps on the 12V rail... (uhh and the PSU must be at least 440W!)
Yes thats true, I presume the 2900 requires about 28/30A. The shuttle PSU cannot provide that afaik, as per the specs.
Infact the SN35P2 Pro has a 400W PSU, so I made a mistake on that - although still not sure on the 12v amperage.
Yeah I seen a few people have an amazing amount of hardware running in a tiny shuttle but thats the first time I have seen a HD2900XT thrown into the mix, thats got a hefty power requirement all by itself.
How long had your Bro been running that set-up?
Only about a month so far Still time to see how it goes..