Originally Posted by szymon247
Thanks. That's what I'll try to do. I believe that my current GPU is powered by a single 14A line at the moment.
Doesn't the PCI-E have its own power though? Excuse me for being an amateur but if I remember correctly my first 7600GT was just plugged in the PCI-E port without any external power lines connected. Wouldn't that plus a 23A 12V2 line be enough?
The PCIe slot can supply 75W, so you can shave ~5.5A from the power needed from the PCIe connectors. However, even these 5.5A come from somewhere, check your PSU manual to see from which one; it should be from the rail that powers the ATX plug.
I've noticed something, but it may be a typo. 440W on the +12V rails means only 36.6A, not nearly the 23+14+23. Supposing the same ratio between the PSU amp rating, but limiting to a total of 440W the rails could supply around 13/8/13 amps. Newer PSUs have one +12V rail so load balancing is much easier.
...the good part is the 460 or the 5850 don't need more than 180W, which is around 15 Amps. They may write 23A on the box, but that's only in order to play it safe.