Dell CN-0GM819 Motherboard Socket-775, 1.80 GHz CPU For OptiPlex 755 MT | eBay
Used-Biostar M7VKQ Socket A motherboard with 1 ISA slot. Supports Athlon, Athlon XP Duron Processors. VT8361/ VT82C686B chipset. 200/266MHz FSB. 2 x 168-pin PC-133 SDRAM DIMM sockets. 1 x I - Walmart.com