It appears that these 2 GPUs use the same socket/interface so physically they will fit.
From what I can see the 8650w has a Quadro 2000m, although I did not see a 8650w with the 2gb version, only 1gb version.
There is some improvement between the two cards:
http
/gpu.userbenchmark.com/Compare/Nvidia-Quadro-2000M-vs-Nvidia-NVS-5100M/m7776vsm8318
This might enable you to be able to play games on low settings, possibly medium if drop to 720p.
Now with that said, physically being compatible with the slot and working with software/bios is 2 very different things.
Find out what exact GPU that person has (2gb by itself is not very helpful), and google that GPU in your computer to see if people have gotten it to work.
Anything beyond $30-40...