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Kingston KVR1066D3D8R7S/2GI 2GB DDR3 1066MHz Server Memory RAM | eBay
A-Tech 4GB (2 x 2GB) RAM for HP Compaq 4000 Pro & 6000 Pro - (Small Form Factor & Microtower) - DDR3 1066MHz PC3-8500 Non-ECC DIMM Memory Upgrade Kit at Amazon.com
Integral IN3T2GNYNGI 2GB DDR3-1066MHz PC3-8500U Memory RAM