Used Xeon E5450 Processor 3.0GHz 12M 1333Mhz works on lga 775 mainboard no need adapter - 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
Xeon E5450 Processor Socket Lga 755 Mainboard No Need Adapter E-5450 Cpu Slbbm 3.0ghz 12mb - Integrated Circuits - AliExpress
462593-L21 HP Intel Xeon X5450 3GHz QC LGA 775 1333Mhz Processor [462593-L21] : Tekmart Africa, Data Centre Infrastructure Solutions