Psu

No, the minimum reqs for the 3870 is 400 watts, PSU's arent 100% efficent so you wont meet that requirement. If your going to invest in a graphics card like that, you should also invest in a good PSU

So what will it affect if all goes wrong? Psu or Graphics card?
 
nothing will go wrong if you don't have enough power. you can start seeing random artifacts and stuff on your screen.........i think, well that's what my friend said.

But also, the psu will probably run hotter if you run like something that is for 400 watt on 300 watt.

You're prone to more frequent crashes and reboots when running a lot of stuff like games.

Also, if the electricity in your house is not stable (like when you turn on that 46 in plasma and the lights slightly flicker) it could cause instability in your computer with weak psu.
 
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