PowerEdge T410 Memory Upgrade Questions.

• I have a T410 currently with a single Xeon CPU E5640. The second processor slot is empty.
• I'm running VMWare ESXi 6.x with several Windows Server 2012 VM's
• I have 3 Samsung 4gb 2r8 PC3l 1060R in memory slots (dual ranked, 1066 Mhz) in A1, A2, A3.

With this motherboard, there are three memory channels,

• 0 which uses A1 and A4 together
• 1 which uses A2
• 2 which uses A3

I want to upgrade memory, preferably without replacing existing chips. I've read a half a dozen posts and haven't found a definitive answer. The hardware guide states these rules:

• Except for memory channels that are unused, all populated memory channels must have identical configurations.
• In a dual-processor configuration, the memory configuration for each processor must be identical.
• Memory modules of different sizes can be mixed within a memory channel (for example, 2-GB and 4-GB), but all populated channels must have identical configurations. This applies to only channel 0.

Questions:

1. Can I put an 8G dual ranked chip in the empty slot A4 for a net of 20gb? That would mean channel 0 = 12gb, channels 1 and 2 would be 4gb each.
2. Can I move a 4gb chip from A3 to A4 and put an 8GB chip in A3? Channel 0 = 8GB, Channel 1 = 4GB, Channel 3 = 8GB
3. Is there a configuration where I can add a single 16gb chip?
4. In the future, I would like to add a second processor, I understand that the A and B configurations have to match, what is my best options for more memory, reusing what I have now and will purchase for the current memory only upgrade?

Notes:

• I will upgrade to the latest bios before upgrading memory.
• I would like to add a second p
• T410 Technical Guide: 
  http://www.dell.com/downloads/global/products/pedge/en/PowerEdge%20T410%20Technical%20Guide.pdf

Related Posts:

• http://en.community.dell.com/support-forums/servers/f/956/t/19451918
• en.community.dell.com/.../19623250
• en.community.dell.com/.../19565276

Thanks!