What kind Of Ram For a V2 Premier v21405?

According to the specs of this one, yu need DDR RAM.
http://www.shopnbc.com/product/?familyid=V21405

i know i need ddr.  i wrote that in the original post.  Isn't there different types of ddr though?  will any ddr work?  don't i need a specific type?

... the SPD section is under the "Motherboard" on the left pane.  Just expand "Motherboard"  (click on the + sign), then highlight SPD.   It will then show you your current memory module(s) and the exact details for each one (rank, speed, etc.)

... it would also be useful to post the motherboard that the system uses.   Just click on Motherboard (under the Motherboard section ==> yes, that's Motherboard - Motherboard), and post the motherboard name here.

this is what i got....  http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6863408980&rd=1&sspagename=STRK%3AMEWN%3AIT&rd=1

is it gonna work?  
(fingers crossed)

Only way to be sure is try it.   The Crucial site lists DIFFERENT memory module part numbers for the Dell Optiplex GX270 (the system the module you bought was pulled from) and your system -- but unfortunately they do not include specifications as to the rank/density of the modules (none of the manufacturers do -- it's very frustrating that they don't provide this detail).   These could just be different part #'s for the same spec memory; or they could be different density modules.   Further, your system may be more tolerant than the Dell, in which case it will work fine.   If you plug it in and only "see" half of the memory, then it's a density issue.   As I noted, the only way to be sure is simply try it ==> that's completely SAFE to do.  (same voltage, same pinout, etc. -- no chance of damaging the system if it's not the right memory as long as you're "static" aware and don't zap the memory slots with a static discharge).

If you have it in hand to look at:
give me the numbers off that sticker.
Give me the numbers off the individual chips.
Tell me how many chips are on the module.
(A close up photo would be good too.)

Usually I can find the data for the individual memory chips through the electronics tech channels and then do the math for the module.

PCBONEZ
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... "If you have it in hand to look at ..." ==> then just plug it in and see if it works !! :-)  :-)