It's a very obvious CPU bottleneck, but the single channel memory is interesting. Either way, this CPU is about to be 7 years old, It's showing it's age. I can't find many Apex Legends benchmarks to confirm or deny that you're falling into the realm of average, but I certainly wouldn't expect to be getting close to say a 5ghz 9700k... See video below
If you rewind to 2014-2015 when this CPU was on the top end, benches were done comparing single to dual channel in games showing almost no difference at all afaik (just checked a bench on gamers nexus). However, It's very possible the games done in such benches were GPU limited due to being run at 1080P and now we're opening a new can of worms...
Personally, I have a feeling you're mostly held back by running that CPU at stock clocks regardless of the single channel memory, it shouldn't be too hard to get 4.6-4.7ghz out of it if you have decent cooling -- you didn't mention what cooler is on there. That alone can be a 10-20+% bump in frame rates unless the lower memory bandwidth is an issue. That still won't get you anywhere close to 200 fps average though.
This video was done to cover the 2600k, but you can see the 4790k (should be about exact same result as a 4.4ghz 4770k) struggling to keep up against modern CPUs. Just so you can get an idea.
I definitely would have gone with the ryzen 3600 over replacing the board, but when money is tight it's tight..
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