Hello John   Yes, as long as all DIMMs are Registered/Buffered DIMMs you can populate it like that. It is preferred to put larger DIMMs before smaller DIMMs, so I would suggest putting the 8GB DIMMs in {1,2} and the 2GB in {4,5,6}, {7,8,9}. Thanks
I want to do a RAM upgrade on a PE T710. Currently I have 24 GB of RAM installed in optimizer mode, there are 18 sockets total, 12 sockets x 2 GB of RAM,sockets A1 through A6 and B1 through B6 are populated,  2 physical chips in the motherboard. I'd like to just add 4 sticks of 8GB of RAM and bring it up to a total of 56 GB of RAM but my problem is that the documentation says that even though I can mix memory modules of different sizes, the configuration for all channels has to be identical. Does this mean that I can't just add 8GB of RAM to sockets A7, A8, B7 and B8 ?  thanks John 
RAM upgrade on PowerEdge TT710