Review on 📈 ASUS Hyper M.2 X16 PCIe 3.0 X4 Expansion Card V2: Boost Your NVMe Storage with Intel VROC and AMD Ryzen Threadripper NVMe Raid Support by Fred Meeks

This card is NOT optimized for PCIE 4.0! For those who don't know, each NVMe drive in this card requires 4 PCIe 3.0 lanes. Each of these lines operates at 984.6 MB/s. So you need 4x 984.6 MB/s = 3.938 MB/s per NVMe drive. Because of this, this card requires 16 lanes in PCIe 3.0 BUT now with PCIe 4.0 each lane runs at twice the speed of PCIe 3.0, i.e. 1969 MB/s per lane. So 2x PCIe 4.0 lanes = 4x PCIe 3.0 lanes. With PCIe 4.0, you only need 8 lanes of PCIE 4.0 to run all 4 NVMe drives. But on top of that, this card SHOULD automatically detect if you're using PCIe 4.0 or 3.0 and assign lanes accordingly, but NO. It still treats PCIe 4.0 as PCIE 3.0, resulting in you only being able to use 2x of the 4x NVMe drives if you plug it into an 8x PCIe 4.0 slot, LOSING half the bandwidth of the PCIE 4.0 slot . Doesn't fit Asus