Each is 6 Cores, 12 Threads, 2.93-3.33GHz. CPU works in any LGA1366 motherboard. Usually CPU overclocks to 4.5GHz and more (if supported by motherboard and adequate cooling). PCB colour may vary. It is a good and cheap upgrade for Mac Pro 4.1, 5.1 (2009-2013), server, workstation, PC.
eBay