Summary: We have purchased two refurbished computers from Walmart. The first one works great and we're very happy. Alas, the 8100 being reviewed here stopped working after a few hours of being started. (Apparently the motherboard died.) The good news is that the return/refund procedure was great, and we had no trouble returning the computer for a complete refund.
Summary: This PC is very powerful but I had a couple of issues with it. I wanted to install VM and run various OSs for testing some programs and applications. this worked. Buyer was able to assist with some VM required settings. Howver, this PC made a lot of noise as if it is accessing or reading from the hard drive. They sent a new optical drive. Did not bother to replace. Just managed it. Howver 2 weeks later. It crashed completely.
Summary: This computer is an HP, so upgrades are limited or not possible. This is a flaw with the HP design, and has nothing to do with the seller. The HP Compaq Elite 8100 CMT has a 320W Power Supply. The Graphics Processing Unit (GPU) used on this machine is a 512MB Nvidia GPU. You can find an MSI 610GT GPU which is 2GB that is within spec (requires a 300W power supply). I would recommend this upgrade, it is the best GPU you can get for a machine with only a 320W Power Supply.