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Appreciate your feedback!
So, using a CPU benchmarking site, I look at the single core scoring and this gives me (hopefully) a way to compare CPUs. So if the 3770 work w/o problem, then that SHOULD give me a way to compare various CPUs (looking at their single core scoring).

One other thing I'm wondering about now - In light of the whole single threaded PPPoE thing, would more cores/threads in a CPU help any other part of the system run better? Or, for example, with a dual core CPU, with one core/thread doing all the PPPoE work, would the 2nd core/thread then be completely sufficient to run everything else?  Or would the 'everything else' part possibly benefit from a 4 core CPU so that 'everything else' would then have 3 cores vs just 1.
Basically, wondering if I should even bother looking at 4 core CPUs, or since dealing with PPPoE, is just a dual core (with proper single threaded scoring) be enough.

Found this in a week old comment in an OPN subreddit:

I have near gigabit internet service (900Mbps down / 180Mbps up - FTTH - GPON terminated on ISP's ONT) and PPPOE on OPNsense connected to CAT5E on ONT. I get full download speed using a Dell Wyze 5070 Extended which has 8gb RAM and a Pentium Silver J5005 CPU (4 x 1.5 GHz with boost to 2.8 GHz). When downloading 900Mbps the total CPU usage is about 34%.

So here we have someone claiming near full gig throughput on a LOWLY Pentium J5005. Base freq 1.5GHz, burst 2.8GHz. 10W TDP which is really nice. 

Yep, I certainly understand that 'challenge' after reading through various posts....hence after searching and not coming up with any answers...is why I'm here asking.

Really all I'm wanting to know is...what minimum CPU (single core speed) would I need for this application?
Would a modern dual core @3GHz be sufficient? Higher? Lower? Would a high speed Celeron work? Or Pentium? Or Core i needed?  AMD something?

(I've been reading through a ton of threads and other sites, but can't seem to find anything definitive)

Started with m0n0Wall, now on pfSense, and looking to move to OPN. This is for home use.

As stated, I have a 1Gbps fiber connection that uses PPPoE. Trying to get a sense of what CPU horsepower I might need for a new box. Looking for CPU that can max out the 1Gb connection.

Need DHCP service and maybe a few other small services, but don't plan on running any sort of IPS or VPN or any other heavy services.

Need a solution that is 1U and is as low heat and low noise as possible but still gets the job done.
The search though seems to begin with the CPU.