Used Xeon E5450 Processor 3.0GHz 12M 1333Mhz works on lga 775 mainboard no need adapter - AliExpress
Intel Xeon E5450 specifications
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
Intel EU80574KJ080N Xeon Quad Core E5450 3.0GHz Socket J LGA771 Processor SLANQ | Xeon 5400 Series | Team Spares