Hello @asc
I run freedombox on a old laptop my self and all is OK. It as a SSD drive and 2 gig of memory with a dual core cpu.
I would leave the machine you set up as it is and track down another old laptop or old desktop ? and setup freedombox on it to get a feeling of what what.
Check out my forum post about installing freedombox on a old lap top.
Regards: peter