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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
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D'oh, PET beat me :)
Took ages to get to page 170 in the manual.
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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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Go into BIOS and change the memory setting to optimizer mode.
It's currently in Optimizer mode and won't let me change it.
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.
No problem.  I've got new memory on order, so I'll leave it as is for now.  Thanks