20.01 Fails on Booting from Install USB

[BSDaemon2020]

I've downloaded 20.01 and made an usb installer, but when booting from it, it fails with the following error messages:

Screenshot of USB Installer Boot Error Messages.

I've tried using two different USB sticks, and burning the image with dd in a terminal window, Balena Etcher, Win32DiskImager, and Rufus. It always gives me the same result.

[ericbsd]

How much ram you have on that machine?

[BSDaemon2020]

It has 32GB (a pair of 16GB dimms).

(Edit: Here's the full specs:)

Ryzen 3900X
B450M-PRO-VDH-MAX
32GB (2x16GB) DDR4 3600 C18
Sapphire Pulse RX590 8GB
ADATA SX8200 Pro 1TB PCIe NVME

[Vermilion]

Did you check your RAM with Memtest? Your usb drives were of same type/manufacturer? What about SecureBoot/UEFI options?