so no problem with RPi 4 right...suddenly i got scared, i spent almost 100 $ to get hands on this.
Yes just for wifi devices. RPi 4 works great with OpenWrt and has top tier performance. Just throw on a USB gigabit adapter, gigabit switch, and U6-Lite and you can beat any all in one router. If only they made a dual ethernet version. The R4S is gaining momentum for that reason, and their upcoming R5S with 2.5Gb.
More should be using the R4S. SDcard simplicity. Dual ports. 4gb of ram. Enough power to do SQM at 1gb speed too.
Even buying a cheap 1gb switch and then something like the U6-Lite its still cheaper than buying one of the all in one new AX routers.
I kinda want the R5S now but honestly its only for the internal 2.5gb ports. But then i'd have to find a 2.5gb capable switch and they are not really consumer prices yet. its really more business/prosumer level. plus when you get to 5/10gb level... there is a good 2nd hand market for fibre switches being swapped out of businesses.
Yea whenever I upgrade my WRT32X, it'll be to the R5S I think then get a seperate switch. Currently the WRT32X is doing SQM at 500Mbits maxing my internet and still do USB3.0 storage with Samba at 120 MB/s maxing out the gigabit lan. Eventually I'll need to upgrade and that'll be the path but right now it's still plenty and perfectly stable (~175 day uptime right now, planning on testing upcoming rc2 on the other partition soon).
R5S is a good eventual choice, but it seems like a slightly slower SoC than the R4S, although it runs cooler on less power.
I'm considering using a device that already supported the official OpenWRT firmware (not snapshot). It's difficult to choose between Raspberry Pi 4 and Xiaomi R3G to run OpenWrt. For R4, I need to buy an extra USB to LAN cable, and the price of R4 in my country is about $100. On the other hand, Xiaomi R3G is only $20, no extra USB to LAN cable of course. I know the flexibility of R4, but the price of the R3G is very affordable as well.
So probably Netgear AX120 is the 'next' R7800?
Also , is the Rockchip in R4s more powefull than Broadcom in RP4b? i guess it is right?
Faster CPU yes, but marginally so. The R4S/R5S and RPi4 are all much faster than most all in one routers. The key difference is the R4S/R5S have 2 or 3 ethernet ports built-in. Big advantage to using a USB to gigabit adapter needed for the Pi.