Is it worth getting pcie 4 nvme drive?

Yes It's backward compatible It'll work as a device even though it would be capable of working in a slot It will work

2 connectors and support for a given spec can differ from slot to slot ) But You can use these PCIe SSDs in PCIe systems, but

can casinos change the odds on slot machines I mean, let's face it, do we want a PCI Express Gen 3 drive that ONLY gets 3,500MBsec when instead we can upgrade to a Samsung 980 or WD

can you tell when a slot machine will hit_ This drive installs into an available 2280 PCIe x4 slot Advanced features such as dynamic write acceleration, error correction code , TRIM support