Hi Rahul, 1. The R810 doesn't support 4x 130 W Intel Xeon processor 7500 series CPUs, so you cannot add more of the same. This is explained on page 5 here: [URL] Page 5 also lists CPUs supported in quantities of 2 or 4. These are all non-Nehalem processors and should support 16GB DIMMs, but you should check each one to make sure. 2. The X5550 is not supported. 3. The R810 only supports RDIMMs running at 1067 MHz. PC3-8500 runs at 1066 MHz, so it would be supported. Anything above this (PC3-12800 runs at 1600 MHz) would theoretically slow down to 1067 MHz. However, DIMMs of higher speeds are not validated to work in the R810 at all. I recommend only buying RAM validated by Dell to work on this system. Dell does not guarantee all DIMMs of a certain type, size, or speed will work in our systems. 4. PC3-12800/PC3-12800R is not supported on the R810, regardless of which CPU is used, for the reasons above. Page 5 of the above guide explains R810 rules on multiple processors, mixing processors, memory capacity, power supply requirements, OS requirements, etc. All of these factors need to be considered before purchasing and upgrading your hardware. This sales page has supported R810 parts available from Dell right now: [URL] Regarding daphco's post ([URL]#M55542), the CPU and other factors aren't specified, so I can't speculate on whether this would work for you. I recommend keeping the BIOS updated. You can download version 2.10.0 here: [URL] Thanks,
Hi Team, I have Dell Poweredge R810 server with Two CPU'S ( E7540). When i had purchased it before four years ago, it came along with 128 GB RAM (8GB*16) and specification as below-  Hynix - 8Gb 2R*4 PC3 - 10600R  HMT31GR7AFR4C-H9 D7 AB 16 DIMM slots are being used as there are dummy ram are fitted into rest of 16 slots because there are only 2 CPU's present and  It was working fine with above specified DIMM.   Now i need to upgrade my server to 256 GB RAM with all exiting configuration hence i have purchased 16GB *16 DIMM but when i tried with this, i was getting error message like "MEMORY IS NOT DETECTED "" SYSTEM HALTED"  New Ram specification - 16GB 2R*4 PC3 - 12800R -11-11-E2-P2  PART NUMBER - 672309-581 Could you please anyone help me here to fix this issue with proper RAM specification? Whether this new RAM’s are not compatible with processor or with motherboard, if not then what would be solution for this? Please provide me details of compatible DIMM with part numbers. Your help would be really appreciated. Regards, Rahul                                   
Dell Poweredge R810 - SYSTEM HALTED WITH 128000 DIMM