I filed my Greencard when I was in OPT and I did not go thru H1. My Greencard process went very smoothly and did not had any problem. The salary I showed when filing my Greencard was $84,000. I guess the salary cap for Masters' in Computer Science is around $80,000 but I am not 100% sure.

 

It depends upon your luck if your Greencard will be approved when filing from OPT, so, why not give it a try. If not you have the option of filing the H1 if there is any quota left.

 

Thanks