IBM xServer 3650 M3 - RAM upgrade

Hello,

we need to upgrade RAM memory on xServer 3650 M3 server to 48GB.

We have this configuration:

Memory
Type DDR3
Size 16372 MBytes (4x4GB)
Channels # Dual

Modules:

Manufacturer Samsung 3x4GB (2Rx4)

Type DDR3
Size 4096 MBytes
Max Bandwidth PC3-10700 (667 MHz)

Manufacturer Hyundai Electronics 1x4GB (2Rx4)

Type DDR3
Size 4096 MBytes
Max Bandwidth PC3-10700 (667 MHz)

I have a offer to buy this modules:

http://www.czech-server.cz/16gb-2rx4-pc3l-10600r-ecc-ddr3-rdimm.html

http://www.czech-server.cz/8gb-2rx4-pc3-10600r-ecc-ddr3-rdimm-1.html

http://www.czech-server.cz/4gb-1rx4-pc3l-10600r-ecc-ddr3-rdimm-1.html

How best to mix modules with respect to performance? Can i combine modules with different capacity (4GB modules with 16GB ).

Thank for reply in advance.

Jazabra