mixed UDIMM RDIMM memory error when all memory is ECC Registered

Question

We have an R620 which has 16 x 16GB. They were supplied originally by Dell and have the part number M393B2G70DB0 printed on them and so a quick google reveals this specwww.memory4less.com/m4l_itemdetail.aspxi.e. RDIMMS which are ECC Registered and Dual Rank We purchased 8 x 32GB RDIMMS from Dell which have the part number M386B4G70DM0 on them so again a quick google reveals this specwww.memory4less.com/m4l_itemdetail.aspxSo they are also ECC Registered and Quad Rank Having read the tech spec I presumed that I would be able to put 8 x 32GB in A1,2,3,4 and B1,2,3,48 x 16GB in A5,6,7,8 and B 5,6,7,8 In particular I noted- Quad rank has to go in 1,2,3,4 (White slots)- Dual Rank should go in 5,6,7,8 (Black slots)- Green slots are left blank However when I did that I got an error on boot up before even the BIOS was loaded than complained about mixed UDIMM and RDIMM and saying to check memory in A5. Have I missed something?

PhilMarsden · Answer

They all have the same part numbers so I don't think they are mislabelled

I've updated the BIOS to 2.5.2 (latest) but not the iDRAC as didn't see how that would affect the problem

So basically it should work but doesn't so I guess I need to raise a support call with Dell

PowerEdge Hardware General

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