New
#11
Well, no - the WEI is most certainly not BS. It's an accurate representation of hardware performance (mostly speed) under what Microsoft considers viable tests of real-world performance. If your WEI went up after upgrading memory, then the new memory was likely faster and was of better quality than the OEM stuff (remember, the OEM stuff is usually NOT high-end kit as there are costs involved with doing so on scale for the OEM, whereas good upgrade components are likely better quality). Graphics (assuming it was onboard) would have been using that new memory, and it would have been faster (thus raising the graphics memory performance, which is a big deal in Windows). CPU tests also test access to the memory (as this is an everyday, all of the time kind of thing) and disk speeds can be affected by memory performance as well (both disk read and write caching and superfetch performance).
Upgrading to FASTER memory has the potential to improve more than one of your WEI scores for these reasons - upgrading to MORE memory (if it isn't a vast speed improvement over the stuff it replaced) isn't going to increase your WEI score, but it is still likely to improve your use case experience overall, as you'll have more room for Superfetch cache and more virtual address space from programs can be stored in RAM and not paged out under heavier memory load.