07-26-2012 10:00 AM
According to the HMM 42W7866 should work in both the T61 and R61..
07-26-2012 05:24 PM
The R61 has nVidia graphics. I assume you know you are putting one in with integrated. The new board supports penryn, which you need, Your existing fan for discrete graphics will work fine with your intel board.
07-27-2012 11:31 AM - edited 07-27-2012 01:50 PM
Yes the motherboard from the T61 is compatible with the R61 computer.
It should work, the T61 42w7866 is shown as a compatible motherboard for the R61 on the Hardware Maintenance Manual.
Hope this helps,
If this does answer your question remember that Ron_9972 gave out the answer first.