Yes, totally 20 users!! (at the same time).
So the RB450 is enough? the uSD card is for web cache or dns cache?
All the 450s have slot for uSD?
Thanks a lot!!
yes, RB450G will be enough. according to http://routerboard.com/rb450g the lowest speed that might occur to RB450G with complex routing configuration (not bridging) is 39.68 Mbps, while your maximum bandwidth is 35 Mbps.
The microsd is used for web cache, i suggest to using sandisk mobile ultra class 10 (minimum capacity 8 GB). Yes, all RB450G has microsd slot
I think USB will be also slow because of software realization of USB stack and will eat CPU. If you need Web Cache use x86 with 2GB RAM and SATA HDD or (m)SATA SSD if necessary.
As far as i know, sandisk mobile ultra class 10 is the fastest microsd. and i’ve been using that to caching web proxy with RB450G over a year (27 active internet users).