First, my specs. It was the first PC I ever built, and is 3 years old this month:
MB: AsRock M3A770DE
RAM: 2 x 4 GB Gskill Ripjaws
HDD: Hitachi Deskstar 1 GB
CPU: Phenom 2 X4 955 BE
PSU: Antec Neo Eco 620C (620W)
Old GPU: Nvidia GTX 460 (768 MB model)
OS: Windows 8.1
New GPU: R9 270X Radeon...