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R810 unrecognised DDR3-12800 DIMM

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My R810 is currently fitted with 64GB (16x 4GB) sticks of DDR3-8500R and we were wanting to bump this up to 128GB. We've got four E7540 Xeons fitted.

We purchased four IBM DDR3-12800R ECC ram (2Rx4, 1.5V, IBM part number is 00D4968) which I thought should be OK, if overspec'd.

Crucial sell some similar RAM (edge.crucial.com/.../mpartspecs.aspx) which seems to be identically spec'd, aside from being 1.35V - and that page states guaranteed compatible with R810. 

My error is: unsupported: DIMM A1 Lockstep pair DIMM A1 & A2 disabled. Please replace the DIMM or remove the lockstep pair.

So why isn't my DIMM recognised? Is it safe to boot anyway (I can't remember if it gave me the option, I reverted back to the original 4GB sticks in order to install a new OS.)

My RAM configuration with the mismatched RAM was:

A1-A2: 16GB IBM sticks (2 slots)
B1-B8: 4GB 8500R sticks (8 slots fully populated)
C1-C8: 4GB 8500R sticks (8 slots fully populated)
D1-D2: 16GB IBM sticks (2 slots)

On boot I get the error for both A1 and for D1, so I don't believe it was a RAM seating error since it always applied to all slots with the 16GB sticks.


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