How 1xCore 800 Mhz processor can be faster than 4xCore 900 Mhz processor? Now I use 750GL with 400 Mhz CP and if only one client connected to PPTP server, maximum speed is 30 Mbit/s and 100% CP load. If i use hex with 720 MHz CP I think it will be 50-60 Mhz limit for only one client and 100% CP load...

Good evening!
I need to test the VPN-server 100 Mbit/s, a few clients on a small device under $ 200 with the OS license.
That device should have a good processor.
Raspberry Pi Model B 2 has a 4 processors core 900 MHz.
Is it possible to run it to install RouterOS?