epmp 2000 swap w/ 3000

I have been listening and reading all the info I can find on the 3000.  1 thing that I haven't found a clear answer for is:

If you have a working sector on epmp2000, all force 200/180 subscribers.  swap the AP to 3000, Is the AP able to talk to multiple radios simultaneously or will the MU-MIMO only work on AC clients (force 300)?

Thank you

MU-MIMO is only an AC standard. The 3000 AP will talk to N SM's one a at a time, and at a 10% reduced rate compared to a N AP talking to N SM's. 

thank you