If you need any extra SSD storage, I'd just use a SATA3 SSD. There's little advantage to using M.2 devices for games.
Anything that needs to move large amounts of data in large contiguous files will show an advantage. They also score with multiple I/O requests from difefrent apps or users, such as database work. Windows will also boot a lot faster sometimes. If you regularly move, save, or write large files, like 4K video files, then a NVMe drive will be blazingly fast. However, with games, there's precious little point in wasting a M.2 slot... especially a NVMe one. Here.... A SATA3 SSD is all you need for games. If anyone only has one M.2 slot, use it for your boot partition, and add a cheaper, larger SATA SSD for your games.
Thanks, I do 4K video editing too, so it might help with that, and I can keep all the Steam stuff on the older SSD.
As a heads up for new people, I've only had TS since December, and already my Railworks folder is over 200GB. The "old timers" here(!), will be much more!
Can we try to keep the tone in this thread friendly and helpful. Everyone will have varying levels of understanding when it comes to hardware. If you suspect someone has inaccurate information, I suggest using your knowledge to help instead of being aggressive.
I have a lot of routes - over 100 at last count plus loads of freeware assets, reskins and the like Plus a lot of Payware items from Just Trains, RSSLO, Virtual Railroads, Sim Express, Rail Studio and others. My Railworks installation is on a 1TB drive and I'm up to 630Gb