not sure im in the right area but i want to increase my PC's ram . at the moment i have

DIMM1: Hynix HYMP564U64P8-E3    512 MB DDR2-400 DDR2 SDRAM  (5-3-3-8 @ 200 MHz)  (4-3-3-8 @ 200 MHz)  (3-3-3-8 @ 200 MHz) 4 512 sticks which is 2 gig ram, now i just want to get 2x2gig sticks, im pretty sure i cant have ddr3 because of my motherboard but can i put something like this in and will it fit and work

http://www.mightyape.co.nz/product/Adata-2GB-DDR2-800-DIMM/3749703/

if not can some one tell me what will work    Thanks