![OFFTEK 4GB Replacement Memory RAM Upgrade for Alienware X51 R2 (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com OFFTEK 4GB Replacement Memory RAM Upgrade for Alienware X51 R2 (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com](https://m.media-amazon.com/images/I/714FAWORj2L._AC_UF894,1000_QL80_.jpg)
OFFTEK 4GB Replacement Memory RAM Upgrade for Alienware X51 R2 (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com
![CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com](https://m.media-amazon.com/images/I/71GNvegbS8L._AC_UF894,1000_QL80_.jpg)
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com
![OFFTEK 4GB Replacement Memory RAM Upgrade for Alienware X51 R2 (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com OFFTEK 4GB Replacement Memory RAM Upgrade for Alienware X51 R2 (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com](https://m.media-amazon.com/images/I/61XmhmEup8L.jpg)
OFFTEK 4GB Replacement Memory RAM Upgrade for Alienware X51 R2 (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com
![A-Tech 16GB (2 x 8GB) RAM for Alienware X51 R2 | DDR3 1600MHz DIMM PC3-12800 240-Pin Non-ECC UDIMM Memory Upgrade Kit at Amazon.com A-Tech 16GB (2 x 8GB) RAM for Alienware X51 R2 | DDR3 1600MHz DIMM PC3-12800 240-Pin Non-ECC UDIMM Memory Upgrade Kit at Amazon.com](https://m.media-amazon.com/images/I/71Z-QO816bL._AC_UF894,1000_QL80_.jpg)
A-Tech 16GB (2 x 8GB) RAM for Alienware X51 R2 | DDR3 1600MHz DIMM PC3-12800 240-Pin Non-ECC UDIMM Memory Upgrade Kit at Amazon.com
![CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com](https://m.media-amazon.com/images/I/41Yo71jv56L._AC_.jpg)
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com
![16GB KIT (2 x 8GB) for Alienware X51 Series R2. DIMM DDR3 Non-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com 16GB KIT (2 x 8GB) for Alienware X51 Series R2. DIMM DDR3 Non-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com](https://m.media-amazon.com/images/I/51+Q8Q+Ha2L._AC_UF894,1000_QL80_.jpg)