my fight with noise is over. I found real source of noise
solution is very, very simple.
my English is too poor for explain i just write what do for total 0 noise from fan, no more change speed after 5 sec and again, again, again… NO MORE!!!
just keep drill and do hole (my have 2,2mm), that all, you can put come oil and stick
almost all t4x fans have bug with magnetic bearing, too long axle, stick with chassis fan do noise, that’s all,
when you do hole, axle go down about 0,8mm and magnetic bearing start work. noise source is between chassis and axle. When step engine w working, axle go up, down, up, down about 0,1mm and this doing mechanical sound. You can check this. Open your think pad, turn on fan on maximum rpm and just unplug fan plug, fan still be rotated but without mechanical noise.
http://i53.photobucket.com/albums/g79/a ... 36-duy.jpg
http://i53.photobucket.com/albums/g79/adasch/fanmod.png
now i don’t hear my fan.
i do it in my 3 thinkpad's, work in 100%
maybe some rewrite this in clear english

edit2:
in this post i show sample how do better contact between fan CPU and GPU
http://forum.thinkpads.com/viewtopic.ph ... 699#424699 [PICS*]
cheers