ERROR 2010 NO MEMORY

I have four Power Edge R905 to upgrade memory wise to 256GB

First two servers no problem

Second two give ERROR 2010 NO MEMORY

Only difference between the first two successful upgrades and the second two failing is that I have moved to a different batch of DIMMS.

And the only difference on the details actualy on the individual DIMMS is in a fourteen digit  number 1029011-0903412 worked fine where as 1029922-0998497  failed.

Logic points to the DIMMS but I think I am missing something---any ideas?

Any experience of this 2010 errror perhaps on other servers?     Regards  DM