here is the answer by testing it myself on the same system and more or less the same processes running. Stock cooling, speed, no energy saving stuff (Cool&Quiet always disabled, special core state disabled or some other bullshit)
test made with AIDA64 Extreme Edition_2.80.2300 before and after the MICROSOFT FIX.
benchmark BEFORE fix : http://doomlord-quiz.no-ip.biz/blacklight/CPU/Report.htm
benchmark AFTER fix : http://doomlord-quiz.no-ip.biz/blacklight/CPU/Report_after.htm
NOTE: my windows was installed 16 November 2010 (yes, more than 2 years ago).
visual aid (i took some screenshots of the results) :
memory read : http://doomlord-quiz.no-ip.biz/blacklight/CPU/1.png
memory write : http://doomlord-quiz.no-ip.biz/blacklight/CPU/2.png
memory copy : http://doomlord-quiz.no-ip.biz/blacklight/CPU/3.png
memory latency : http://doomlord-quiz.no-ip.biz/blacklight/CPU/4.png
CPU Queen : http://doomlord-quiz.no-ip.biz/blacklight/CPU/5.png
CPU PhotoWorxx : http://doomlord-quiz.no-ip.biz/blacklight/CPU/6.png
CPU ZLib : http://doomlord-quiz.no-ip.biz/blacklight/CPU/7.png
CPU AES : http://doomlord-quiz.no-ip.biz/blacklight/CPU/8.png
CPU HASH : http://doomlord-quiz.no-ip.biz/blacklight/CPU/9.png
CPU VP8 : http://doomlord-quiz.no-ip.biz/blacklight/CPU/10.png
FPU Julia : http://doomlord-quiz.no-ip.biz/blacklight/CPU/11.png
FPU Mandel : http://doomlord-quiz.no-ip.biz/blacklight/CPU/12.png
FPU SinJulia : http://doomlord-quiz.no-ip.biz/blacklight/CPU/13.png
conclusion : the fix does improove some of them.