Originally Posted by Track
Are you suggesting that GTX 590 has 575w at its disposal?
I should think it would have all the power it asks for 'at it's disposal', up until the point where the PSU's OCP circuit(s) kick in and shut down the PSU.
There may be some multi-rail PSU's out there that wouldn't allow you to draw a whole lot more than 150W through each 8-pin (i.e. the few that actually deploy spec-stringent OCP circuits), but if you had like a single +12V rail 850W unit, it would very happily provide 575W to your 590 (provided your total system load didn't trip the OCP for the entire unit).
In this particular case, the question then becomes: "are the wires on the PCI-Ex cables of a low enough gauge that this kind of current draw doesn't cause them to get too hot and melt their sheathing?"
Looking at the gauge of the PCI-Ex power cables on my 850W single-rail unit, I'd guess that they could easily transmit 250W per cable w/o an issue. On a very cheap/improperly spec'ed unit though, like Phaedrus mentioned, if they used higher-gauge wires ... there could conceivably be a problem with this sort of draw.Edited by brettjv - 3/30/11 at 1:17pm