Adding a lot of RAM to a Supermicro server

[ytoledano]

This is what I currently have:
Supermicro X9DR3-F
2x Intel Xeon 2690v2
128GB (8 x 16GB) 1866MHz DDR3 ECC Registered. Dual Rank. 1.5V

In the not too far future I want to upgrade to 256GB. I'm having a hard time understanding from the motherboard manual if it's OK to add 8 more 16GB dual rank sticks and what frequency the RAM will work at if I do.

This is the motherboard site:
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DR3-F.cfm

I appreciate any help!

 

[dealcorn]

Page 2-15 of the manual suggests:

"Other Important Notes and Restrictions
•
For the memory modules to work properly, please install DIMM modules of the same
type, same speed and same operating frequency on the motherboard. Mixing of
RDIMMs, UDIMMs or LRDIMMs is not allowed. Do not install both ECC and Non-ECC
memory modules on the same motherboard.
•
Using DDR3 DIMMs with different operating frequencies is not allowed. All channels
in a system will run at the lowest common frequency."

 

[Ketchup]

It says up to 1 TB. Same frequency of course (as with pretty much any board.)
So what is the question?

 

[ytoledano]

The part that worries me is where it says "Populating RDIMM (ECC) Memory Modules". In the table it says that only under certain conditions I will get 1866 mhz. I don't understand what's the differnce between slot per channel and dimm per channel and in what cell is each config - the current and the future.

 

[Ayah]

you should be looking at the bottom table of page 2-13 of the user manual.

you're running v2's, with 16 dimms over 2 sockets = 8 dimms over 1 socket. as each processor is quad channel, you have *2 slots per channel* physically available on that board. as you're currently using 8 dimms, assuming you installed the memory correctly, you're running 1 dimm per channel (DPC) and since you're running 1.5v dual rank (DR#, where # is 4 or 8 based on data width) memory, that gives you available memory speeds of 1066, 1333, 1600 or 1866.
[you'd be at the intersection of the DR4 or DR8 horizontal line [depending on your dimms], and the 2 slots per channel column. currently, you'd be in the 1DPC subcolumn, and its 1.5V vertical line. ]

after you add 8 more dimms, assuming dual rank AND 1.5V, you will get available memory speeds of 1066, 1333 or 1600.

the 3 slots per channel is there because some boards support it.