Greetings, i've just bought a used vtx3d 7870 black edition and i have some questions regarding the power draw of the card. The system this card is going to consists of a g3430 pentium (53w), a h67 mATX m/b, 2x 2gb 1333mhz ddr3 ram, hdd+dvd, the regular stuff. The psu is a deer 400w, not very...