"9-10 A0 and 9-10  B0" are not part numbers or complete specifications.  They have nothing whatsoever to do with ANY vendor specifications AND this is not a Dell Support Question.

I guess i should have made it more clear with my Question ..But it is a Dell support Question as my Aurora came with Elpida 1GB 1Rx8 PC3-10600U-8 -10-A0 DDR3 Desktop Memory Ram EBJ21UE8BDF0-DJ-F and i want to know if Ram like Elpida 2GB 2Rx8 PC3-10600U -9-10 B0 DDR3 Desktop Memory Ram EBJ21UE8BDF0-DJ-F would be compatible with my System..Sorry for the Confusion on my Part..But i think i figured it out as i Think the B0 is Because it is 2Rx8 instead of 1Rx8

Mixing Ranks, density, speed This  is not supported.  Depending on dual or Tri channel they must be in sets of 2 or 3 or 6

Micron Purchased ELPIDA in 2013

Micron Technology, Inc. - About the Elpida Acquisition 

EBJ21UE8BDF0-DJ-F  Appears to be a Generic Marking

4GB (2X2GB)

ELPIDA EBJ21UE8BDF0-DJ-F 2Rx8 PC3-10600U-9-10-B0 Desktop RAM 1333MHz

Thanks for the Info..I am going with  6 sticks of 

ELPIDA DDR3 2GB 1RX8 PC3-10600U-9-10-A0...Everything is the same as the original except it is the 2 GB Module