To have a X570 in ITX (Asrock TB3) i can say that if the A320/A520 were too limited, the B550 is more than capable to do the same things than X570 on ITX size (but when i get mine there was no B550 in ITX size) for less money and less heat.

I build myself a new system every 5-6 years. Today I'm doing a walkthrough with a pile of newly acquired components before putting this one together. Every time I do this things have changed since the last time and I get stumped on something. This one is an ITX case with a Gigabyte X5770SI Aorus Pro AX mboard and an AMD Ryzen 7 5700G cpu. My top priority for form factor; onboard graphics is fine for me so no graphics card. But I also got a Creative Labs Sounblaster Z PCIe sound card, and I can't figure out where it goes on the mboard. There's just one long PCI slot. What am I missing? (ok, you can judge. I'm 68 years old and just learn enough to be dangerous. Once this is together I will forget completely what I've done.) I hope someone sees this and sets me straight.

good asus, they real put mutlichannel audio even on a mini-itx... cough cough asrock!