Sandy Bridge platform, nope, the platform lacks the necessary power and the HP prebuilt unit will be limited to an incompatible BIOS environment. you would need to get something more concurrent like a Haswell platform if you'd like to drop in a GPU above the GTX600 series.
If you want to work with what you have, you're yet going to have to change the PSU with more wattage+of a better quality and be able to drop in a GTX650