Best Graphics Card For a Dell T3400 [375watt psu]

I really dont want to upgrade the psu at the moment since im kinda on a budget and sorta not worth it. But if it really not safe to run on current psu ile wait. And will the bottleneck be not worth it?
(By the way i just bought this off ebay for 100$ last week)
Im looking to use this for awhile for some gaming than build a new pc sometime later when i can save up. (Some new games and some old games)

Stats:
T3400 Dell Precision
4Gb Ddr2 800Mhz Ram
Q6600 @ 2.4Ghz
500Gb HDD
L375P-00 PSU Factory
Nvs Quadro 290
1280 x 720 Monitor

My Psu comes with a 6-Pin Auxiliary PCI-E Power. Im Pretty sure this is required for GPU requiring more than 75 watts. Now my question is could this PSU handle a 7790 ? Ive read it has a
500W Min Power Requirement But Only draws around 90 watts http://www.guru3d.com/articles_pages/radeon_7790_review_benchmark,6.html.

Also the price of this card new is around 90(7790) which goes for the 7750(80ish) that i was looking at since it only require the power to the Pci lane.
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More about graphics card dell t3400 375watt psu
  1. when you look at your psu what does it give for amps on the +12v rail.

    I usally recommend the 7750 for computers with stock Power supplies.
  2. tenaciousk said:
    when you look at your psu what does it give for amps on the +12v rail.

    I usally recommend the 7750 for computers with stock Power supplies.


    +12VA /18A MAX
    +12VB / 18A MAX
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