If you're looking for routing a 1 GBit/s WAN, even more so with link aggregation, the r7800 is not an option, read up the details at:
Without having a performance reference for the r8000, I would seriously doubt that it can cope with that either. It was released in friggin' 2014, what do you think, how many 1 GBit/s prosumer home connections exist back then; that wasn't even on the table for commercial branch offices using 1000 quid routers.
1 GBit/s routing and above is still firmly within the enterprise domain, especially beyond that (link aggregation) you are looking at mid-end x86_64 only (intel i5/ ryzen 5 and up), combined with a good AP (this role can be fullfilled by the r7800/ nbg6817).