WEI Score Info
Something I should point out is that the WEI index has changed since Vista, not only has the maximum score been increased but the scales used to rate components have changed, so the scores generated in Vista are not directly comparable to those in Windows 7. Scores generated in Windows 7 Beta are not directly comparable to those generated in Windows 7 RC either. For those curious to know Vista caps the scores to a maximum of 5.9, and Windows 7 caps the WEI scores to 7.9.
WEI scores are not arbitrary numbers based on the amount of system RAM, GPU RAM, or hard drive size, although these can help influence the score indirectly. Larger mechanical HDD's will on average outperform smaller capacity drives, for one example. Performance of these components is going to have the largest impact on the score, although obviously a Quadcore will be needed to gain the highest CPU scores, and having just 1GB of system RAM just isn't going to perform very well either.
For those no doubt wishing to know the details: Here's the breakdown regarding the Windows Experience Index score
Engineering the Windows 7 “Windows Experience Index”
There was also an update on how the GPU scores are computed and some further changes to HDD index scores have been made, which I'll paste below:
In Windows 7, there are new random read, random write and flush assessments. Better SSDs can score above 6.5 all the way to 7.9. To be included in that range, an SSD has to have outstanding random read rates and be resilient to flush and random write workloads.
In the Beta timeframe of Windows 7, there was a capping of scores at 1.9, 2.9 or the like if a disk (SSD or HDD) didn’t perform adequately when confronted with our random write and flush assessments. Feedback on this was pretty consistent, with most feeling the level of capping to be excessive. As a result, we now simply restrict SSDs with performance issues from joining the newly added 6.0+ and 7.0+ ranges. SSDs that are not solid performers across all assessments effectively get scored in a manner similar to what they would have been in Windows Vista, gaining no Win7 boost for great random read performance.
Source
Since everyone seems to want to see my score (and a certain someone PM'd me for it) with a 4.2GHz Core i7 920, well here it is:
Believe it or not a 4.2GHz Core i7 920 is not fast enough to get the maximum 7.9 score.
Also my RAM was only scoring a 7.8 until I tightened the timings and tuned my system to eke out that 7.9, so triple channel 1600MHz CAS 7 memory is the benchmark for the memory index score . My GTX 260 is the base model, not a Core 216 or a highly clocked card so I'm sure a GTX 285 would at least make 7.0.
Apparently my 4.2GHz Quadcore almost meets the criteria for an 8-core PC.
As examples, we anticipate many quad core processors will be able to score in the high 6 to low 7 ranges, and 8 core systems to be able to approach 7.9. The scoring has taken into account the very latest micro-processors available.
If anyone is dying to know I'll run the overclock to 4.4GHz and see if that gets a 7.9 or not. A bit more practical solution for raising my score, is that I've been planning a major SSD upgrade once the second generation of Intel SSDs are launched in the coming months.