I've had five different 2388's in the last five years. My brother has had the same 9650 STS during that time frame. His 9650 will do just as much as my five different combines would do. I'd say they were very comparable. So surely the 2377 has to have less capacity than the 2388's had, therefore I don't think it will do as much as a 9650 STS. Horsepower makes a big difference in capacity. If you don't have the power you're not going to stuff the material through the rotor. I think the 2377 will do a good job, but you may be disappointed if you think it will do as much as your 9650 STS.