Mix n Match

im trying to get these to put on my system…
will they work.

Newegg.com - CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail

Which motherboard?

DDR and DDR2 are physically and electrically incompatible, so you cannot use them in the same slot. Should a motherboard offer support for both, you can only run one or the other at the same time.

the memory thats in there now is 184-Pin DDR 333 (PC 2700)

i got 2x512MB on rite now just trying to upgrade to 2gb… this is my fuck around computer and it is sllllooooooowwwwwwwwwwww just trying to get it a little quicker.