CPU amperage PSU requirements +SLI

[amiga600]

Hi there,
I have figured out my 8800GTcards in SLI draw 24 Amp at load.
My PSU is rated for 34 Amp.
How much amp does my CPU draw?
Initially I worked out 110Wtdp/ 1.3v = 85AMP

but obviously the CPU takes power off the 12v Rail.

As I will be overclocking the CPU, will the CPU even run at stock speeds and not draw too much amp off the 12v Rails?

I am looking at 12V/ 85.6amp and i get a voltage close to 0.14 or 1.4volts.
But I need to know how much amp load off the 12V line as I have 24 amp out of the 34 amp used.

Responses would be great!

I looked at this thread:
http://www.tomshardware.com/forum/301655-28-amps

Also, I will be using a 2 X molex to 6 pin PCIE connector for the second card.





Motherboard:
GA-K8N-SLI
(Socket 939)






CPU:
Opteron 170
110Watts TDP
1.3v / 1.35v





PSU:
ANTEC NEO ECO 450W

OUTPUT:

+5V +12V -12V +5VSB +3.3V
20A 20A 34A 0.8A 2.5A

+12V Maximum output: 408W






GRAPHICS (SLI)
8800GT SLI 512MB
http://www.anandtech.com/show/2365/13

Minimum 450 Watt for SLI mode system.
(Minimum recommended power supply with +12 Volt current rating of 24 Amp)











Opteron 939 CPU amperage PSU requirements 34AMP 12V 8800GTSLI 24AMP

 

[DonkeyOatie]

Running a PSU at close to 100% is less efficient. You GPUs can make short demand spikes and this extra power comes from the PSU main capacitors.

I would not attempt to run a pair of 120W GPUs on a 450W PSU to allow a decent amount of reserve overhead. (especially since you have only 410W on your 12V rail.)

The maximum load I would want to put on that PSU with one GPU would be about 300, a bit less with two GPUs.