Last night I installed x6 2GB (Dual Ranked) PC3-10600 ECC RDIMM's in to my T310 (w/ Xeon X3440), and it did not work. Removing the RDIMM's from slot 5 and 6 resulted in the system working normally. All the RDIMM's are healthy, the ones pulled from 5 & 6, work in 3&4, not to mention this RAM was pulled from a functioning server to begin with.
As I cruised the Technical Guidebook, I get lost.
http://www.dell.com/downloads/global/products/pedge/en/poweredge-t310-technical-guidebook-en.pdf
On page 36 - Table 9, it suggests x6 2GB 1333 RDIMM's is supported (PC3-10600 = DDR3-1333Mhz, right?)
on page 38 - Table 12, it suggests by the *, that Dual Ranked RDIMMS are only supported in all three channels; if they are in 16GB or 32GB configuration (which neither is divisible by 6, so not sure how this applies)
on page 40 - Table 8, is suggests 2GB RDIMM's are supported for 12GB using 6 RDIMM's
Do I need a BIOS update? I could use some clarification, and possibly might enjoy the functional theory behind why this isn't working.