4 core INTEL Core 2 QUAD Q6600 Socket LGA 775 CPU Processor 2.4Ghz/8 M /1066MHz) - AliExpress
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INTEL xeon E5410 socket LGA 775 Processor (2.33GHz/12MB/1333MHz) core2 quad core CPU no need adapters warranty 1 year - AliExpress
Amazon.com: E5450 E5450 Intel Xeon SLANQ Or SLBBM Quad-Core 3.0GHz 12MB 1333MHz Socket 775 Works On LGA 775 Mainboard No Need Adapter : Everything Else