I'd say that if you're upgrading to 3900X(T) a motherboard upgrade wouldn't be required, but you might see more stability going with a B550 motherboard. The only reason I'd go with an X570 board is if you needed the PCIe 4 speed for your hard drives. Otherwise, a B550 or staying with the X370 would be my recommendation. Hard to say when there will be a price drop, a lot of the recent releases are very limited in supply right now. Because of that and the already discounted prices on the 2nd Gen Ryzen CPUs, I would not expect the prices to drop very soon. However, I'm not one of our buyers and this is purely speculation and I hope I'm wrong. 😊I hope this info helps. Please let me know if you have any other questions or concerns!
Unless your SSDs are PCIe 4 or you need the additional CPU lanes, I would recommend the B550. It's a great option without all the expense. The new GPUs don't yet fully use the bandwidth of PCIe 3 and don't yet require PCIe 4. There are some exceptions but specifically for gaming, this rings true. In the future that may change, however, the new GPUs are still compatible with PCIe 3 and again don't require PCIe 4 at this time. It really depends on your budget and what your goals for this build are in the future!
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