Hi Abdurrahman, It looks like 2666 MHz support was later added to the R730, so the DIMMs should work, but they'll be slowed down to 2133MHz (to match the others). You are correct about the slot population. Thanks,
Hello, I have a R730 with 2x E5 2670 v3 and 2x 16 GB - 2RX4  RDIMM  2133 MHz. I am thinking to upgrade the memory with 2x 32GB - 2Rx4 RDIMM 2666MHz. In R730 owner's manual, it is said that frequency can be 1866, 2133 or 2400. So can this 2666MHz memory module work at 2133MHz with 16Gb-2133 MHz memory modules without any problem? For the populations of the module, I think It should be 32GB to A1-B1 and 16Gb to A2-B2 slots, If it is wrong please correct me. I am adding the memory modules link below. Thanks for your help. [URL] [URL]
R730 Memory Upgrade and Configuration