CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63

It works. It didn't work immediately for me, as I did get the ram card missing beep code. After a while of cleaning and correctly seating it, it worked! Hasn't crashed ever since, 07/19. Don't mind the dirt and dust. :)

Arrived very quickly, and worked perfectly. I had been worried that the low price would mean that there would be trouble with the quality, but such was not the case.

Purchased RAM for Christmas for my son's Alienware computer, as it said it was compatible. Also used the expert installer option and they were fantastic. The RAM did not work from the get-go. We got the dreaded "BSOD" numerous times all with different error codes. Took the installer several hours trying everything to get the RAM to work, alas nothing. Took out the new ram and installed the old. Computer is working fine, no issues whatsoever. Returning this product asap. Needless to say my son is not happy with his defective Christmas present.

Worked as stated and has been working for over a year now. I am only sorry I didn't post sooner.

Replaced my old memory for Alienware x51 r2 perfectly and was recived on time as expected.

Excellent ! Working on ALIENWARE X51 R2 ! Now with 16GB !

Do not be decieved my the title of this!!! Waited a whole week for it to come in and it doesn't even fit!!

Works fine