Processor Speed

Hi, I have Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz 2.00 GHz (2 processors)

so this means i have a total 4.00 Ghz processor ?

There are 2 processors installed to my mother board.

but the max speed i am getting is 2.3 Ghz.

It showing all 12 cores in Task Manager but speed is limited to 2.3 Ghz with turbo boost on in bios and utilizing 100 % CPU.

Please suggest and help.