PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
500W (or greater) power supply with one 75W 6-pin PCI Express power connector recommended
600W power supply (or greater) with two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
i would say something old, ATI 4000 series or equivalent Nvidia, and even that may strech the power consumption a bit. just get a good 550w psu and something like a 5770 or better.
mates i have the same problem and i have 350w psu to.. but the fact i wanna ask is almost the same can i run on my psu a Nvidia gtx550ti, or hd5770?
And the fact is that now i have 9800gt and it runns 100% good on my current psu..
which requeres the 400w psu ? so
For a 350w psu.. go for a hd 7750. Even a hd 7770 will work but with a cheap psu it's risky. gtx 550 ti consumes a lot of power.. try gtx 650 its better in regards to power consumption.