Does having three PSU 19A rails mean I can't run a 24A GPU?

[MikeRossyBoy]

*I tried to look for a PSU sub-forum but I couldn't see one so I put it here*

I recently upgraded from a ATI 4670 to a nVidia 460 (768MB) running it on my 620w CoolerMaster PSU.

Since installing the 460 it would crash in pretty much every game, but when i tested Furmark (albeit for two minutes) it was fine. I thought my PSU would be fine but I had a look at the box and it only has three 12v rails giving 19A of current while the 460 recommends 24A of current to work.

Is this why the 460 was flakey in performance as from what I understand a PSU doesnt split rails etc

I looked in the instruction book but it doesnt mention what rail does what.

 

[MikeRossyBoy]

Thanks for the replys Final8y and kitch9 but while I thought about it the card pulls 75w from the mainboard and the two pci-e connectors then supply 75w each so its unlikely that all the 24A will all come from the third rail for example.

The instruction book says the first and second rail operates half the 8 pin CPU connector each and the second rail operates the 24 pin ATX connector, so im guessing it must come from different rails.

If only I hadnt seen that XFX 'one rail is better than two' stuff on their website!