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.
If the game is genuinely fun, no, it’s all wank. I still use an HDD and the load times are long but not long enough to justify buying more stuff.
The video even shows it makes a difference, although it only touches on that part, with no in-depth analysis. Some modern games don’t work properly on HDDs and you get tons of glitches and pop-in.
In older games it probably won’t affect much more than load times though.