Update on Card Saga
So I took the advice and went out and bought a 600W OCZ Powerstream (for future growth if I ever want to go to an SLI configuration) and bought the nVidia 7950 the EVGA KO overclocked version. Took the boxes home waited till the kids went to bed and got down to some serious fun. 3 hours later I had everything hooked up (unbelievably cramped chassis, I had to move drives, swap cards around etc..) but in the end it got done. I hit the power button and I get......zero....zilch....nada......the fan kind of spun limply like a wet noodle in the wind for a second and gave up the ghost.
Now I am panicking did I fry the mobo, is there some proprietary gotcha from HP I don't know about? Who knows....I fiddled around till 3:00 AM and gave up, my computer looking like a patient from CSI with all its guts hanging out. Sad pathetic thing.
Got to the OZC support board the next day and they told me how to test the psu for power without a full hookup...I did that and nada, zilch, zero. The psu is busted.
Now I had a choice take the card out? put in the old one or try it on the old psu. I took a chance and re=hooked up the psu (350 W, 18A on 12v rail). I used the handy dandy joiner that comes with the card (takes two mobex inputs and turns them into a pci express power plug). Hooked everything back up and powered up. Everything worked like a charm, the sweet sound of my old power supply was running (Very quiet actually except for at start up).
Anyhow I figured its workind and I left the card in. Went into COH and at the highest quality settings and a couple of ultra's I got a max frame rate of 136 from the in game tester. That's good enough for me. The graphics are phenomenal.
Not sure if I am gonna go through the trouble of upgrading the psu or not, now that it seems to work. I'll try it out for a couple of days and see how it goes. I've got the card temperature log going so I can keep an eye on that.
So I don't get this thing with the psu needed for the card, its working ok with the 350W? How come? The hard drives are running on SATA connectors could that reduce the load requirements?
And thanks to everyone who posted their replies, it was a fun adventure in the end and got to learn a lot.
If anything changes I'll post again.