I have a Home desktop I have upgraded into a gaming desktop.
I replaced the graphics card that cam with it(a 512 MB basic one meant for standard browsing) with a GTX 670, it now has 16 GB of ram, a 2 TB hard drive(spinning at a standard 7000 rpm, which I would like to one day when it is more efficient replace with solid state) and a 3.4 GHZ quad core I7 processor. my computer rates on the Microsoft scale 7.9/7.9 in all categories except for hard drive, which is rated a 5.9 due to it's speed.