Intel Xeon D 1541 is a server processor and operates at higher base and turbo frequencies. Clock speed have been increased by 100 MHz and operate at 2.7
Intel Xeon D-1521 is a server class processor that is based on Broadwell micro architecture. Xeon D-1521 will operate at 2.4 GHz and have the maximum Turbo Boost frequency
Intel Xeon E5-2600 v2 is a server processor that is based on Brickland platform and Ivy Bridge architecture.