An ivy-bridge i7-3770 is way more than needed to do 1 GBit/s wirespeed, even including SQM - an ivy-bridge c1037u could do that in my tests; without SQM, baytrail-d Atom or newer can do the job (easily) - modern Atom probably including with SQM. More modern x86_64 systems will save you a lot on electricity - and a carefully selected system might pay for itself within rather short time.