Samsung's 990 Evo SSD supports PCIe 4.0 x4 and 5.0 x2 and I hope it's the first of many hybrid solutions

pcgamer.com:

A listing for Samsung's upcoming 990 Evo SSD has appeared online. Though the release of a 990 Evo series SSD is not at all unexpected, its PCIe lane configuration is surprising, and it's an interesting configuration at that.

The 990 Evo listing popped up on Samsung's Ukraine website (spotted by WinFuture). It reveals the drive supports both PCIe 4.0 x4 and PCIe 5.0 x2 connections. The specifications show the drive will support 5000MB/s and 4200MB/s read and write speeds respectively. Compared to the best SSDs, that's nothing special, and well within the capabilities of a PCIe 4.0 x4 connection, but it's the 990 Evo's hybrid PCIe 5.0 x2 support that got my attention.

Of course, there's nothing stopping you from using a PCIe 4.0 x4 drive in a PCIe 5.0 x4 slot, but doing so means the drive uses up four PCIe 5.0 lanes—a waste of valuable lanes. In the 990 Evo's case, PCIe 5.0 x2 support won't hurt performance, but it opens up some flexibility potential. I don't see any benefits for mainstream users at this time due to current chipset configurations, lane implementations and a lack of laptop PCIe 5.0 support, but in the future, I believe this dual support flexibility is a smart thing. 

Future chipset derived lanes will move from Gen 4 to Gen 5 at some point, but motherboards already face cooling and electrical challenges with Gen 4 drives—not to mention their steep cost. Boards with a full set of Gen 5 slots will cost even more than they do now.

There are two probable stumbling blocks to x2 M.2 SSD adoption, one of which is motherboard support. Motherboard manufacturers would consider hard-wired x2 slots as limiting performance. OK. How about some proper bifurcation support then? A board supporting a single PCIe 5.0 x4 drive