The Vista WEI scores are pretty lame, the Win 7 ones are updated and are considerably easier to discern differences in performance due to the higer range.
The max score on the Vista WEI is 5.9 meaning if you get a 5.9 you have the top of the line performance in that category. With Win7 7.9 is top of the line. Here's my score on my older, slower 6860FX running Win 7 ultimate, overclocked gpu, t8300, 80GB x25-m SSD:
This is a stock p7805u running Win 7 Home Premium 64 bit:
Primary HD 5.8
This is what that same stock p7805u gets on Windows Vista HP 64:
Primary HD 5.7
Hope that helps you put WEI into perspective.
Edited by eugenepvd - 3/20/10 at 8:54am