![2GB Kit 2 X 1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com 2GB Kit 2 X 1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com](https://m.media-amazon.com/images/I/41fhjZ5TtGL._SR600%2C315_PIWhiteStrip%2CBottomLeft%2C0%2C35_PIStarRatingFIVE%2CBottomLeft%2C360%2C-6_SR600%2C315_SCLZZZZZZZ_FMpng_BG255%2C255%2C255.jpg)
2GB Kit 2 X 1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com
![CN-0HY175 HY175 For DELL Dimension C521 Desktop Motherboard Mainboard 100%tested fully work - Newegg.com CN-0HY175 HY175 For DELL Dimension C521 Desktop Motherboard Mainboard 100%tested fully work - Newegg.com](https://c1.neweggimages.com/ProductImageCompressAll300/B1A6D22041210ELL43A.jpg)
CN-0HY175 HY175 For DELL Dimension C521 Desktop Motherboard Mainboard 100%tested fully work - Newegg.com
![1GB (1X1GB) Memory Ram Compatible With Dell Dimension C521 Series Desktop By CMS A99 - Computer Memory Solutions 1GB (1X1GB) Memory Ram Compatible With Dell Dimension C521 Series Desktop By CMS A99 - Computer Memory Solutions](https://www.computermemorysolutions.com/wp-content/uploads/2019/06/DDR2-240PINDIMMX1Front316444-162-1024x1024.jpg)
1GB (1X1GB) Memory Ram Compatible With Dell Dimension C521 Series Desktop By CMS A99 - Computer Memory Solutions
![4GB Memory Upgrade for Dell Dimension C521 Desktop PC 4 X 1GB DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM (PARTS-QUICK Brand) 4GB Memory Upgrade for Dell Dimension C521 Desktop PC 4 X 1GB DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM (PARTS-QUICK Brand)](https://m.media-amazon.com/images/I/611t9Prv+pL._AC_UF894,1000_QL80_.jpg)
4GB Memory Upgrade for Dell Dimension C521 Desktop PC 4 X 1GB DDR2 Non-ECC PC2-6400 240 pin 800MHz DIMM RAM (PARTS-QUICK Brand)
![2GB Kit 2 X 1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com 2GB Kit 2 X 1GB DDR2 Memory for Dell Dimension C521, Dell Dimension E521 PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com](https://m.media-amazon.com/images/I/716VZQgLCKL._AC_UF894,1000_QL80_.jpg)