So i have a Dell inspiron E1505 and i have 1GB of RAM (2x512MB). i would like to get 4GB 2x2GB. but i don't know whether to get 200-Pin DDR2 SO-DIMM DDR2 800 (PC2 6400) Dual Channel Kit Laptop Memory or 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300) Dual Channel Kit Laptop Memory. i don't know if my laptop can deal with DDR2 800mhz RAM or if i should get the 667mhz RAM. any ideas?