![Parts-Quick 4GB Memory Upgrade for Dell Dimension E521 Desktop PC 4 X 1GB Compatible DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM at Amazon.com Parts-Quick 4GB Memory Upgrade for Dell Dimension E521 Desktop PC 4 X 1GB Compatible DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM at Amazon.com](https://m.media-amazon.com/images/I/611t9Prv+pL._AC_UF894,1000_QL80_.jpg)
Parts-Quick 4GB Memory Upgrade for Dell Dimension E521 Desktop PC 4 X 1GB Compatible DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM at Amazon.com
![1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz NON-ECC DIMM RAM () - Walmart.com 1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz NON-ECC DIMM RAM () - Walmart.com](https://i5.walmartimages.com/asr/b637e2ff-ee4d-425a-a0a9-009f651a233f_1.e59e54bb11f627001984730c5db9df6d.jpeg)
1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz NON-ECC DIMM RAM () - Walmart.com
![4GB Memory Upgrade for Dell Dimension E521 Desktop PC 4 X 1GB DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM (MemoryMasters) at Amazon.com 4GB Memory Upgrade for Dell Dimension E521 Desktop PC 4 X 1GB DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM (MemoryMasters) at Amazon.com](https://images-na.ssl-images-amazon.com/images/I/515B2txVZHL._AC_UL210_SR210,210_.jpg)
4GB Memory Upgrade for Dell Dimension E521 Desktop PC 4 X 1GB DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM (MemoryMasters) at Amazon.com
![OFFTEK 512MB Replacement Memory RAM Upgrade for Dell Dimension E521 (DME521) (DDR2-4200 - Non-ECC) Desktop Memory at Amazon.com OFFTEK 512MB Replacement Memory RAM Upgrade for Dell Dimension E521 (DME521) (DDR2-4200 - Non-ECC) Desktop Memory at Amazon.com](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/714FAWORj2L._AC_UF1000,1000_QL80_.jpg)
OFFTEK 512MB Replacement Memory RAM Upgrade for Dell Dimension E521 (DME521) (DDR2-4200 - Non-ECC) Desktop Memory at Amazon.com
![4GB KIT (4 x 1GB) for Dell Dimension 4700 5000 5100 5100C 5150 (DM051) 5150c 8400 C521 E510 / E510n E520 E521. DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com 4GB KIT (4 x 1GB) for Dell Dimension 4700 5000 5100 5100C 5150 (DM051) 5150c 8400 C521 E510 / E510n E520 E521. DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com](https://m.media-amazon.com/images/I/81IYEllX4iL._AC_UF894,1000_QL80_.jpg)
4GB KIT (4 x 1GB) for Dell Dimension 4700 5000 5100 5100C 5150 (DM051) 5150c 8400 C521 E510 / E510n E520 E521. DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
![Refurbished: Dell Dimension Motherboard 0UW457 E521 w/ AMD AD03600IAA5DD Athlon 64 X2 1GB RAM Motherboard Accessories - Newegg.com Refurbished: Dell Dimension Motherboard 0UW457 E521 w/ AMD AD03600IAA5DD Athlon 64 X2 1GB RAM Motherboard Accessories - Newegg.com](https://c1.neweggimages.com/productimage/nb640/AH8W_132018951010051791goPGAt7JYf.jpg)