[quotemsg=21120497,0,328798][quotemsg=21120476,0,2752725][quotemsg=21120468,0,43340]In general, the computer industry really needs to standardize a set of features that are compatible with this relatively new "4x4" option for PCIe x16 expansion slots. One of the main and most important reasons is the proven fact that Intel's DMI 3.0 link has the exact same upstream bandwidth as a single M.2 NVMe SSD. There is an obvious engineering elegance that obtains with 4 x NVMe M.2 SSDs @ x4 PCIe 3.0 lanes = x16 edge connector. And, the availability of idle CPU cores has rendered obsolete the need for dedicated Input-Out processors on AICs (add-in cards). Another compelling reason is the 16 GHz clock rate now approved for the PCIe 4.0 standard. Even if it ends up being a "premium" feature, there is a need for high-end desktop computers to support modern RAID modes with this "4x4" functionality, in the same manner that native SATA ports ended up supporting modern RAID modes. This is a natural, and inevitable, evolution to the NVMe standard which was invented in part to eliminate the overhead inherent in the SATA protocol (read "to maximize speed").[/quotemsg]
The industry already has this . it is called PLX Switch Chips. and they exist in many Motherboards/products.Cards[/quotemsg]
Aren't those just "dumb" switches, though? @supremelaw mentioned RAID...
PLX chips will make the system see more lanes (double or more than double) and there are many PLX chips available.
you can see them all here
download the PDF of each model and read.
and they arfe not dummy they act like ACTIVE Lanes with ports. Actually some one made an M2 Card with PLX chip that supported RAID and was reviewed here a while ago. That card does not even need X299 chipset to boot in Raid. it works on any Standard X16 Slot.