Upgrading x3400

looking to upgrade acer x3400 slimline pc current stats:

windows 7 home premium 64bit
CPU Type QuadCore AMD Athlon II X4 640, 3000 MHz (15 x 200)
Motherboard Chipset nVIDIA GeForce 9200, AMD K10
6gb ram
psu 220w (low i know)

looking to update the psu and gpu, psu i could leave out case as have searched everywhere to get a decent one to fit and all are 150 w
graphics card im looking for is gtx 550ti (if it will fit) but most likely will need a low prifile
basicaly i want to run battlefield 3 meduim setting at least

any suggestions?

budget is around 120-135 max not bothered about cpu aslong as it can work the system without any trouble can get a gtx 550ti 80 so around 55 for psu

was thinking about leaving the psu and just getting a ati 5570, 40w at most and its a efficent system, could it cause any damage and whats the chances of it happening

I guess you answered yourself :slight_smile: