install one more CPU to HP z840

I have a HP z840 with a single CPU Processor - Intel Xeon E5-2660v4 2.0 2400 14C and I would like to upgrade it to dual CPU processor. Can I just buy one more Intel Xeon E5-2660v4 2.0 2400 14C and install it?  And change the single processor air cooling kit to dualprocessor air cooling kit?

Thanks