I'm wanting to get a budget graphics card for my computer however I only have a 400W PSU. I've been looking at the AMD 7770 which I can pick up for about £90. Will this card will be a little too demanding on power for my PSU? Should I go with the 7750 which I understand uses less power? Or should I buy a better PSU and get a different graphics card? Bare in mind I don't really want to spend more than £120 in total and I'm not a serious gamer.
I am using:
intel core i5 2400 CPU
cheap H67 chipset motherboard
4GB ram ddr 1333mhz
I guess I would need an amp-meter to check my +12V rail, which I don't have one to hand. The PSU is nothing special, it is just the stock one that came with the case so I can't imagine it is a high quality one. Should I just play it safe and get the 7750? Or are there other cards i should consider?