ASUS Pro WS WRX90E-SAGE SE vs ASRock W790 WS R2.0

These are different platforms, not two versions of one board. The ASUS Pro WS WRX90E-SAGE SE is an AMD sTR5 board for Ryzen Threadripper PRO, with 8 memory channels, 7 PCIe 5.0 x16 slots and 4 M.2 slots. The ASRock W790 WS R2.0 is an Intel LGA4677 board for Xeon W-2400 and W-3400, with quad-channel DDR5 and 4 PCIe 5.0 x16 slots. Pick by the CPU you need. Threadripper PRO gives more memory bandwidth and more full-speed slots; Xeon W gives a wider CPU range and a lower platform entry. Owners of the ASUS report both strong performance and some boards that failed to power on, so test it early.

• Choose the ASUS Pro WS WRX90E-SAGE SE if you need 8 memory channels, 7 full-speed PCIe 5.0 x16 slots and 4 M.2 drives for Threadripper PRO workstation work.
• Choose the ASRock W790 WS R2.0 if you want a Xeon W-2400 or W-3400 build with quad-channel DDR5, 4 PCIe 5.0 x16 slots and 10G Ethernet.