Hi everyone, I own a dell Inspiron 560s with pentium dual core e6700 and an hd 5570. Anyways, on the HD 5570 it sais the minimum power supply recommended would be a 400watt PSU, but my PSU is 250w. I've been using this card for almost a year now with no problem, and I want to upgrade to the GT 640. I looked at some benchmarks online and it sais the GT 640 uses about 10 more watts than the hd 5570 on average, but the minimum psu for the GT 640 sais 350? Anyways I was wondering if the GT 640 would work on my PSU since a card that recommended 400+ watts worked on it. I'm going to use it for some light 3d modelling and maybe some gaming like Black Ops 2, etc.