TL;DW:
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You’ll want a PCIe 3.0 NVME drive at minimum for an optimal gaming experience. Anything beyond PCIe 4.0 is excessive and is a poor use of your money.
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SATA SSDs are still viable but on the cusp of unplayable.
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And lastly no one should game on a HDD/harddrive as the performance is beyond abysmal.
I got a small PCIe 4.0 nvme for my os drives but realized that except for loading screens being longer my games don’t really mind living on a 2x16TB HDD RAID1 Array. It worked so well that I moved my /home to the raid1 array.
Now I don’t play many AAA fps games and some games got silly long loading times (bg3 comes to mind) but after the startup it behaved properly.