my PSU is a thermaltake 650watt 80+ bronze certified model, i forget the exact model. i have a i5 4570, 8 gb ram, and 3 500gb hdds currently. HIS's website says i need a 1000watt psu but that seems like overkill, but now im scared i might need a new psu. Guru3d find that the card consumes about 243watts and has a tdp of 250 watts, and needs 2 8 pin (2x150w=300watt) conectors. will i have to shell out hella cash for a new psu? if i do, it will not go over well with my dad, whom i convinced to buy this card.