4GB DDR3 240-Pin Memory RAM Upgrade for Dell Optiplex 390 790 990 Computer PC | eBay
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Amazon.com: Dell Optiplex 390 Business High Performance SFF Desktop Computer PC (Intel Quad-Core i5-2400 up to 3.4GHz, 8GB DDR3, 1TB HDD, HDMI, DVD, Windows 10 Pro 64-bit) (Renewed) : Electronics
CMS 8GB (2X4GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 7010 - A71 at Amazon.com