Throughput is key
I've done some benchmarks on a couple of systems recently.
The first was a Power 7 beast (there is no other word for it.) running AIX & Linux
The other was a quad socket Intel Xeon (latest models) rig running Linux
The application software was setup identically on the three configs.
The Power 7/AIX managed 36000 messages per second.
Running Linux on the same hardware gave us 26500/second
The intel machine managed a paltry 14,240/second.
sure the Power 7/AIX combo is expensive but the X86 world (in these particular circumstances) lags well behind the RICS System.
Then add in the mix the LPAR management in the Power Range and it is one hell of a solution.
IMHO, the X86 architecture is well past its sell by date. Intel recognised this. Itanic was not the answer. Simply die shrinking X86 to improve performance will not make up for the obvious shorcomings in the CPU Architecture.