I have HP PROLIANT ML350T G6 XEON E5620, only 1 cpu. currently I have in total 8gb (2 gb each - 500656S21 ECC HP 2GB 2RX8 PC3-10600R-9), i installed them according to the DIMM configuration from the server case. can I just add another 8gb (1 slot)? or it's better to add 2 gb each? I just want to make sure I can maximize the channel speed... and if I removed all existing memory and install a 16 gb stick, does the performance equal to 2 gb x 8?