No, a motherboard can't bottlneck anything. You can't overclock on it, but it'll run full boost speed and allow you to run your memory at whatever speed it's rated for up to at least 2933
Not really, but can't overclock cpu.
Motherboard will not bottleneck anything for normal usage, only possibility is PCIE lanes which is more than enough for 1 gpu.
To me, the bottleneck is CPU, you should get a Ryzen.