I have a new build that I want to power up but do not have the PCI-E power cables. It has a MSI GTX 970 with 1x6-pin and 1x6+2-pin. I just received Rosewill's third attempt to send the correct cables and again they are keyed wrong and won't plug into the power supply. I am not looking at running any games I just want to have video for web browsing and email. I don't want to phuck anything up but it's been sitting here for a month and who knows how much longer it will be. Will it run off of just the 75W from pcie 16x slot as a non-gaming graphics card ?