WingDog, The issue you are running into is with memory channel matching. Although mixing SR and DR dimms is supported, you will still have to match  the dimm layout across the memory channels. As seen below, the channels cover 3 dimm groups per processor. [IMAGE] With you only having 4 of the DR dimms, you wouldn't be able to populate across all three channels per side. What I suggest is that you place the DR dimms in the slots you have them in, so A1, A2, B1, and B2. With the SR dimms though you need to place them in A4, A5, A7,A8, B4, B5, B7, and B8. That should allow the server to operate correctly.  Let me know how it goes.
Hello. I have R710 with two E5530 CPUs and DIMMs: 4x2Gb DR 8x2Gb SR how to populate it correct? now I have wrong config with a1-a2 + b1-b2 - DR a3-a6+b3-b6 - SR  Thanks a lot
R710 Memory population with SR and DR