Hello. Can you test each of the new memory modules one at a time on slot A1? Some of the new modules could be faulty.
Hi! We have an T310 server. It works good 2 x 4GB SAMSUNG M393B5273CH0-YH9 DDR3 1333MHzREG ECC DualRank RAM. We purchased 4 x 4GB SAMSUNG M393B5273DH0-YH9 RAM. If I put 6 x 4GB RAM, the server knows 12GB. The server writes: membist failure the following dimm has been disabled by bios: DIMM A1, DIMM A3, DIMM A5 if I put 4 x 4GB RAM (1--3 RANKS and 2-4 RANKS), knows 8GB RAM! The server writes:  membist failure the following dimm has been disabled by bios: DIMM A1, DIMM A3.  It's like, the "channel A" has been disabled. The Windows Server 2008 R2 Standard sees 24GB, but available 12GB! BIOS version: 1.8.2, CPU: X3440. Thanks, Istvan  
DELL PE T310 RAM upgrade problem