I’ve got a 5 gig connection with google fiber. I want to increase the amount of concurrent connections I can have and saw Wendell’s vid about setting up a pfsense box with an 12 gen cpu.
I have an 8th gen i3-8100t and wonder if this would be fast enought to support 5g?
Also I’m pretty nooby on networking, if I run the dhcp server from the pfsense box i setup, i put my google router in bridgemode and then can use an old tp link wifi router as an access point?
Yes and absolutely not. Depends what you’re tryin to get out of it.
Passin 5Gb into a 10 gig NIC (recommend for price / performance and support) and routing to another 10 gig NIC and a 4 port NIC with each branching off?
Absolutely capable
Want to do deep packet inspection on all 5 gigs of data?
NOT EVEN CLOSE
I recommend setting up the box with some add in NICs then figuring out how you can play/optimize
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You could get something like this that supports 1 million concurrent connections 
https://store.ui.com/us/en/pro/category/all-cloud-keys-gateways/products/uxg-enterprise
I am told that the CPU upgrade it has is allowing a single stream to get around 7gbps as well which is quite impressive for a low power router chip. So you would be able to max out your 5gb connection with both single and multiple packet streams without worry, and would be hard pressed to ever reach the concurrent connection maximum in a home environment.
Probably well outside the budget and scope of what you were looking for though.
Ok you got me curious here. What kind of CPU/RAM does this need?
Depends on your filter table, good rule of thumb is an additional core per gigabit filtering x2 (1- WAN 1-LAN) plus 512megs RAM per gigabit.
This places you at 10 physical cores and 4GB RAM in addition to the baseline.
If you look at the enterprise grade solutions, they typically have 32 cores to handle 10 gig which is inline with the suggestions.
Of course, your filter table will ultimately determine efficiency.
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