The R310, R410, and R510 all can take the same memory. The R210 and R210 II do NOT support RDIMMs, while the above servers take UDIMM or RDIMM memory (but not mixed), so R210 memory will work in the others, but memory from the others may not work in an R210 (depending on what type they have).
Do the R310's use the same type of memory as the R410's R510's and R210's?
memory compatability