Noob powersupply question

[Rustyy117]

I have a Coolermaster Realpower M700 powersupply and im wondering if its enough for my heavily overclocked rig.

[strike]The beast! [/strike] Rig.

Core i7 920 @ 4Ghz HT on
Gigabyte X58-UD5
Gigabyte HD5850 @ 1000/1200
3 x 1GB OCZ Triple channel 1333mhz 7-7-7-21 @ 1200mhz 6-6-6-16
Samsung Spinpoint F3 500GB
LG DVD ROM Drive
Coolermaster Real Power M700
Coolermaster HAF932
Custom GPU and CPU Water loop
5 x Fans

So I've noticed when I overclock my HD5850 and play a game my PSU will whine like a little sister really loud and annoying. I noticed that under heavy load my 5850 eats almost 42amps (according to GPU-Z)

My PSU has 4 12V rails (Here comes the first thing I'm not sure about) and my card uses 2 x 6pins provided by the PSU, So I take it that my card uses 2 of the 4 rails?

The 12v rails are rated at 19A each and allow for a total draw of 624 watts. So if im right in my assumption then my PSU can only give my GPU 38Amps (2 x 19) and as I mentioned before it eats nearly 42 amps under heavy load.

So that lead me to believe that the whining noise is becasue my PSU is working harder than it should in an attempt to provide enough amps. (?)

Really would appreciate some info

 

[RetiredChief]

Enjoy

 

[Rustyy117]

Best answer selected by omgitzfatal.