Advice for WISP Base Station

Hardware MikroTik hardware general
6

RB1100AHx2 have 2Gb of ram @ 533MHz (DDR2), 2 core @ 1,066GHz

RB2011UiAS-xx-xxx have only 128Mb of ram @400MHz (DDR) and one single core @ 600MHz
I think as user concentrator can manage surely 50 users, for 100 I have no idea…