i upgraded my server from an intel NUC7i5BNK i5-7260U. would this be better than the nanopi r4s that i am currently running for openwrt? i am using SQM and adguard home and have a 400 mbps up/down connection
From a CPU performance point of view, yes…
…but the r4s should be able to cope with what you mentioned and there is no better than good enough.
From an I/O point of view, the r4s wins with 1+1 ethernet ports, which isn't a bad feature to have for a router (but alderlake-n n100/ n97 'firewall PCs' with four 2.4GBASE-T ports would win here…).
In terms of power consumption, the r4s probably wins as well (although the NUC7i5BNK probably isn't bad either, just relatively worse).
From a security point of view, less is more…
…and having too much headroom just raises the temptation to do silly things, to widen the attack surface by running non-router tasks on your border gateway (and this already includes running OpenWrt as a VM inside a hypervisor, with other stuff).
A router is usually a quite black or white question and deterministic, either it is fast enough (with healthy margins) for your given wan speed XOR it is not. If the contractual wan speed is the bottle-neck, a faster router won't make it bettererererer.
While I have no personal experience with the r4s, my understanding is that 400 MBit/s should not pose a problem for it.
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400Mbps is definitely enough for 400Mbps SQM, and this little metal brick is very nice for running OpenWrt with some networking LXCs on it (I have it, can integrate with PiHole easily)
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