Hi, I bought a prebuilt a bit ago, but want to put a GPU in it for better performance, though, my PSU limits that QUITE a bit, its only 180 watts, was going to buy a 500 watt PSU and a GPU but my psu is quite weird and only plugs into the mobo in 3 places..one by the CPU/cooler one next to the wifi card, and a slot of Protruding pins that say FAN ATX, i have NO idea how to upgrade...can someone help? Thanks, also,the system in question is a HP Pavilion 590 w/R3 2200g