I've said it before and i'll say it Again.
Please dont take the WEI scores too seriously , they are weird for UNKNOWN(or known only to a chosen few .....
) reasons.
As long as u have 2GB of Decent RAM(>=667) and arent noticing a lag or anything ,you should be fine.
FYI , My Kingston Value RAM (2GB DDR2667) scores 5.9
