Hello,
a) Single Intel Xeon E5-2650 (8 Cores, 2.00 GHz, Cache = 20M, Bus Speed = 8GT/s)
b) Single Intel Xeon E5-2690 (8 Cores, 2.90 GHz, Cache = 20M, Bus Speed = 8GT/s)
c) Dual Intel Xeon E5-2620 (12 Cores, 2.00 GHz, Cache = 15M, Bus Speed = 7.2GT/s)
c) has a 50% increase in number of Cores...