I think you'll face no problem with RX 7600 + MSI B450 Gaming Plus Max. Lets take a look:
That's the OP's mobo with a poor design at the upper PCI-E vs Components.
There is no enough room for a huge (and thick ( ͡° ͜ʖ ͡°) ) GPU like RX 7600, specially when we talk about the Gaming OC version from Gigabyte. Actually it would be no problem for the mobo and gpu themselves but this specific audio component and the metal piece of the GPU are a huge problem.
That's the mobo you want to buy. It has waaaay more room to fit a huge gpu like that. I think you'll be fine. It's very difficult to find GPUs with a different position for the upper PCI-E and i think AMD wouldn't produce any gpus that need more room in the upper side of the mobo. They always tend to place the PCB at the upper side instead of the shroud with fans bc this would be a huge mistake and the gpu wouldn'f fit bc of the ram slots.
To conclude: you can buy your awesome RX 7600 and it will fit perfectly in your MSI B450 Gaming Plus Max).
