IntelÃÆ'ƒâ€šÃÆ'‚® XeonÃÆ'ƒâ€šÃÆ'‚® E5-2640, 6 core, 2.5GHz Processor SR0KR(B-Grade) - Central Valley Computer Parts
Intel Xeon X3430 3.9 GHz, stable on air, validation link in comments : r/overclocking