Hi, i have purchased a gtx 970 today and i want to install it into my dell optiplex 9020 (not the aio) but the tower one. it has a stock 290W power supply. i inserted the gpu perfectly into the the PCI slot however i need to attach the PCIE 6 pin connecters ( 2 of them into the gpu) so i figured i need a new power supply, is it possible to upgrade it to a 550-600 WAT? Thanks alot