Need a new video card, low power supply, suggestions?

I posted before, but I thought I'd post again with some more detailed information since the answerers in my previous post found it lacking (it was).



MODEL:m8120n

MOTHERBOARD: ASUS P5BW-LA (Basswood 3g)

here's the full motherboard specs

http://h10025.www1.hp.com/ewfrf/wc/docum…



PROCESSOR: intel core 2 quad q6600



MEMORY: 3gb, ddr2, I believe there are 4 sticks, They're positioned behind alot of stuff so i couldn't get a clear look



VIDEO: This is what I need, the old one died



HDD:2x320gb 7200rpm Standard SATA



DRIVE: SuperMulti LightScribe DVDR/RW



POWER: 300watt, Not sure what parts are relevant, but i'll type up all the rail information anyways

+12Va --- 18A 12Vb --- 18A

+5V --- 13A +5Vstb --- 2A

+3.3V --- 15A -12V --- 0.8A

Power of 12va 12vb total 300W

Max continuous power equal to 350w (not sure what this part meant)



Other stuff:

Memory card reader in front

TV Tuner- cable





I need suggestions on what kind of video card my current system can handle. I was following this guide:

http://www.youtube.com/watch?v=LTQoH-j5K…

and the links it provides, and I'm currently looking at a gts 450 or a radeon HD 5770. Can anyone tell me if my current power supply could handle it? Also, any other better alternatives would be great too.|||I have a Q6600 too for now, and i recently bought a radeon hd 5750 1GB. Pretty good, but im getting a new computer soon. This is no use for anything anymore..|||Vid card chart

http://www.youtube.com/watch?v=kCRPWe2yU…



Low wattage PSU's and GPU's Guide ...

http://www.youtube.com/watch?v=LTQoH-j5K…