Not true. You should look up Sienna chips and something like ASUS S14NA-U12. It has six DDR5-4800 channels, two physical PCIe 5.0 ports, two M.2 ports, and six MCIO x8 ports. All lanes are full-bandwidth. The 8434PN CPU gets you 48 physical cores in a 150W envelope. Zen 4c really is magic, and LOTS of bandwidth to play with.