i want to use ryzen 3000 but I want to do that under 400$. the problem is I only have 2400mhz ram. I want to get a 3600 but can I run a 3700X on a b450. I was thinking the MSI A Pro. would this be a fine combo? Or should i get a 3600, MSI B450 tomahawk, and 3000mhz ram?