Upgrade Z820 with a second CPU

Hi,

I have a Z820 with the following parts:

Motherboard:

System board (motherboard) assembly - Supports 2S/DDR3 1333 MHz memory (Patsberg) - For Windows 8 Professional

708610-601

CPU:

Intel Xeon Eight-Core E5-2640 v2 64-bit processor - 2.0 GHz (Ivy Bridge Romley-EP, 20MB Level-3 cache size, Intel QPI Speed 6.4 GT/s, 95 W TDP (Thermal Design Power), Socket 2011/LGA2011)

733617-001

Heat Sink:

636164-001

6x RAM:

Hynix 8GB (1 x 8GB) DDR3 PC3-14900 1866MHz

So my plan is to buy a second "Xeon Eight-Core E5-2640 v2 64-bit processor - 2.0 GHz" and double the RAM. 

I can't find a manual of the motherboard...

What do I have to consider?

BIOS setting? Jumper on Mainboard? Power supply Watt? 

Thanks for any information!

best regards,
Fredrik