So I just bought the Sonata II case and it arrived today, came with the Smart Power PSU. Well it's rated 450 Watts and the ratings on each of the rails are: +5V = 30A +3.3V = 32A +12V(1) = 15A +12V(2) = 17A -12V = .3A +5V SB = 2.0A So it has dual 12V rails, right? So it should have enough power for a single X1900XT? I'm a little confused, I checked the PSU sticky and I think it just confused me a bit more x_x
Well... typically on dual rails, one is reserved for the CPU ATX 12V connector - the seperate 4 pin jobby. The other has to power the GFX card, drives, and fans. Not easy with that much rail. Hope this helps, can't give exact figures but I think you can see why you are having issues here. Typically if you max out one of the supplies, the other is much reduced - a lot of PSUs have a figure of around 28A combined on both rails.
Thanks, another (stupid) question though. There's another cable coming out of the PSU labled "PCI-E" that looks like it would fit into my video card, but the manual for the X1900 says I should use the cable that splits the power to the Video card and the HDD. Is there a purpose for that one PCI-E cable then? >_>
