OCZ DDR2 PC2-8500 Reaper HPC, 4GB Edition (OCZ2RPR10664GK) at Amazon.com
4GB KIT (2 x 2GB) for Dell Optiplex 380 780 Mini Tower 780 Small Form Factor 780 XE Small Form Factor. DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
KOMPUTERBAY 4GB 2X 2GB DDR2 1066MHz PC2-8500 DDR2 1066 (240 PIN) DIMM Desktop Memory with Heatspreaders at Amazon.com
12GB KIT (3 x 4 GB) for Dell Studio Desktop Series XPS 435 XPS 9000. DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon .com