Dell server memory configuration on R410

I have an R410 that had all 8 memory slots with 2 gig dimms.  I replaced A1 & A2, B1 & B2 with 4 gig dimms.  When it booted, it displayed this wasn't the proper memory configuration.

Can someone please tell me exactly which dimms go in what slots?

Thanks
J.R. SitmanAsked:
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Handy HolderConnect With a Mentor Saggar maker's bottom knockerCommented:
The larger DIMMs should go in the two sockets furthest from the CPU and the smaller ones in the two sockets nearest the CPU (one black and one white clips). That would put 4GB on each channel so be optimal, That means A1 and A4 should have the 2GB ones (A1 and A4 are on the same memory channel).
Ditto for B side.
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Handy HolderSaggar maker's bottom knockerCommented:
D'oh, PET beat me :)
Took ages to get to page 170 in the manual.
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J.R. SitmanAuthor Commented:
I did as you instructed.  At boot up it displays unsupported memory configuration.  Dimms A1, A2 & A3 and B1, B2 & B3 should match
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J.R. SitmanConnect With a Mentor Author Commented:
I moved the 2 gig to slots 1,2,3 and the 4 gig to 4.  I booted without error.
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Handy HolderSaggar maker's bottom knockerCommented:
Go into BIOS and change the memory setting to optimizer mode.
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J.R. SitmanAuthor Commented:
It's currently in Optimizer mode and won't let me change it.
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Handy HolderSaggar maker's bottom knockerCommented:
Probably old BIOS, Dell had some crazy limitations on memory configuration on some of their servers, I don't think they read the Intel manual properly. Either that or you're trying to mix UDIMMs and RDIMMs and it's disabled some slots to make it work.
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J.R. SitmanAuthor Commented:
No problem.  I've got new memory on order, so I'll leave it as is for now.  Thanks
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