I have 4x2Gb DIMMs newly installed in my Dell Precision T1500, but the BIOS (and OS, Linux 64-bit) are only reporting 4Gb. DIMMs are all identical: http://uk.crucial.com/gbr/en/precision-workstation-t1500/CT4050244 They all work individually. BIOS (v1.0.1) reports them as DDR3 SDRAM Dual Channel, 133x10 The only way to get 4Gb is 2x2Gb in DIMM1 and DIMM3 slots (blue and black), which doesn't make much sense to me. Any other configuration is either ignored or won't boot. Any suggestions?
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