Dell Poweredge R510 memory upgrade

Hello.

There are two Dell Poweredge R510 servers with following configuration:

CPU: Intel Xeon X5675 (3.06GHz, 6C, 12Mb cache)

Additional CPU: Intel Xeon X5675 (3.06GHz, 6C, 12Mb cache)

64Gb RAM per 2CPU (8x RDIMM 8Gb Dual Rank LV) 1333MHz

We'd like to upgrade the servers with 128Gb RAM.

What is most suitable way to do it?

Can I just order 8 modules per 16Gb RAM and replace?

Thanks in advance for your help.