DIMM vs RDIMM

[quanttrade99z]

Hello

I'm about to buy a DELL PRECISION for running critical trading office applications. I need to choose the RAM specs...
I'm not sure which to get... is it worth paying extra for RDIMM? WHat is the difference? Thank you!


4GB, DDR3 Memory,1333MHz, ECC (4 DIMMS) [Included in Price]
4GB, DDR3 RDIMM Memory,1333MHz, ECC (4 DIMMS) [add $170]
4GB, DDR3 Memory,1333MHz, ECC (3 DIMMS) [add $40]
4GB, DDR3 RDIMM Memory, 1333MHz, ECC (3 DIMMS) [add $210]
3GB, DDR3 Memory, 1333MHz, ECC (3 DIMMS) [subtract $150]
3GB, DDR3 RDIMM Memory,1333MHz, ECC (3 DIMMS) [add $90]
2GB, DDR3 RDIMM Memory, 1333MHz, ECC (2 DIMMS) [subtract $200]
2GB, DDR3 Memory, 1333MHz, ECC (2 DIMMS) [subtract $240]
4GB, DDR3 Memory, 1066MHz, ECC (4 DIMMS) [subtract $110]
4GB, DDR3 Memory, 1066MHz, ECC (3 DIMMS) [subtract $80]
3GB, DDR3 Memory, 1066MHz, ECC (3 DIMMS) [subtract $220]
2GB, DDR3 Memory, 1066MHz, ECC (2 DIMMS) [subtract $290]

 

[Blain]

Stick with the straight ECC.
RDIMM is registered memory.

 

[RebateMonger]

Edit:
ViperGTS, in another Topic, posted a more complete answer from Dell's User Forums:
Dell Forums