  That should work with the 4GB DIMMs in 7/8. I edited a couple of my posts to clarify some limitations with the quad rank DIMMs, and the 1.35v CPU. I added two notes clarifying that the quad rank DIMMs will operate at 800 MHz when populated 2 per channel, and that the 1066 MHz speed limitation for the 1.35v CPU applies to dual rank or higher DIMMs when populated with a minimum of 2 per channel. In the context of our conversation I don't think it confused you, but I wanted to clarify the information for future readers. Let us know if there are any issues with the upgrade. Thanks
Hi, I need help to upgrade with 16GB module for my R710 My R710 is already populated with 32GB memory module of config (G484D) -- DUAL IN-LINE MEMORY MODULE..., 4G, 1066, 2RX4X72, 8, 240, REGULATORY can I upgrade it with (A5008568) -- 16GB 2Rx4 RDIMM ECC 1333MHz LV in below configuration in Optimizer mode??? pls. suggest. In this way with this 16GB modules if I intermix with previous 4GB 1066mhz module my total accumulated memory perfomance would go down 1066mhz? logically which is not suggested   DIMM_BANK_A_SLOT_1 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_A_SLOT_2 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_A_SLOT_3 -  DIMM_BANK_A_SLOT_4 - 16GB 2Rx4 RDIMM ECC 1333MHz LV DIMM_BANK_A_SLOT_5 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_A_SLOT_6 -   DIMM_BANK_A_SLOT_7 -  DIMM_BANK_A_SLOT_8 DIMM_BANK_A_SLOT_9     DIMM_BANK_B_SLOT_1 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_B_SLOT_2 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_B_SLOT_3 -  DIMM_BANK_B_SLOT_4 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_B_SLOT_5 - 16GB 2Rx4 RDIMM ECC 1333MHz LV  DIMM_BANK_B_SLOT_6 -  DIMM_BANK_B_SLOT_7 -  DIMM_BANK_B_SLOT_8 DIMM_BANK_B_SLOT_9
R710 Memory Upgrade possibility with 16GB module