SlimT :
And what do you mean 7750?
Like a Radeon 7750?
If you meant that, that wouldn't work at ALL.
"400W (or greater) power supply recommended"
"Minimum 4GB of system memory"
I do, in fact, mean a Radeon 7750, and yes, it would work just fine. It's not like a graphics card is going to say it can't work because you don't have enough RAM, and as for the power draw, well... you aren't going to find anything that's GOT a lighter power draw than a 7750.
I would recommend you pick one up and try it - if it doesn't work, then it doesn't work, but any other option is going to be old enough that it'll be rare, which means it will be very, expensive... and will perform way worse anyways.