Upgrade Alienware X51 R2: remove the old video card - YouTube
Upgrading GPU on Alienware X51 R2 | Alienware Arena
Alienware X51 R3 – Specs and upgrade options
Is the Alienware x51 r2 upgradeable and if so what should be upgraded : r/pcmasterrace
Upgrading an Alienware X51 R2 Video Card | DELL Technologies
Today, my 11 year old joins the PCMR, for $260 I got an Alienware X51 R2 i7-4790K/16GB DDR3/GTX 960, I added an HDD then Win10, pleased to see that his games run