Small contribution, but hope it will help some:
http://www.youtube.com/watch?v=tUpHA_ZarDg
http://www.youtube.com/watch?v=_2vnJyRuq98
So, I did a few upgrades recently, and for the ones who would like to try it, I have some tips:
Use Wood's metal, it's cheap and will do the trick, You can perform the upgrade with the simpliest iron available next door. Also use the finest wick available, it will suck the excess solder like hell. And flux massively!
You can check Your unit before, if it is using 22 or 33 ohm resistors. Just to have them aligned. Not sure if it counts or not.
Although the memtest utility can pin half of the memory for the first run, what You can do is to start in one session with 64m, next session with 32m, next with 16m and You're there, almost all You're new memory is tested fully.
ELPIDA D5116ADTA chips are also fine for the upgrade!!
For Vuk: I had the same symptoms, recheck all Your soldering, especially the resistor/s and of course all the pins for shorts to the neighbours. And even if You have FW which isn't capable to handle 128, You can use the tftp method to flash a new one. So no panic, it'll work.
Thanks to Oleg, and all the contributors here!
