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Internal SSD with the operating system on it. No other upgrade I've made to my PC has ever been so substantial.
I have my OS on an NVMe drive and it's one of the best decisions I made when building.
But the jump from SATA SSD to nvme is much less noticeable than the one from HDD to SATA SSD
HDD, SSD and NVMe all have different versions. Later generations are normally 2x faster than previous version. Comparable generations are normally an 8x speedup. (Later generations are in parentheses).
HDD to SSD is like 80(160)->300(600).
SSD to NVMe is 300(600)->2400(4800, 14000).
So, it's likely a similar upgrade, unless you did HDD-g1 to SSD-g2 to NVMe-g1 (using G1/G2 to simplify).
It's also likely possible that your computer is running so fast that a doubling or quadrupling in speed is a diminishing return as you don't notice the difference.
You're looking at the wrong numbers. Most people won't notice the difference in transfer speeds for large files. Most people will notice boot and loading times, where the results are diminishing.
Let's take a theoretical system that has an HDD and boots in around 30 seconds.
It gets upgraded with an SSD. According to your numbers, the Boot time would be better by a factor of around 3 or maybe 4, making the Boot only take around 10 seconds. That's a difference of 20 seconds, clearly noticeable.
Now it gets upgraded to an nvme drive. The speed increases by an even greater factor of around 7 or so, but you barely notice that because the PC only boots 7 seconds or so faster, much less noticeable than the 20 second difference before, despite the drives being blazing fast in comparison.
I'm not saying nvmes are worthless or anything. Just that in day to day use for most people its not as noticeable as the HDD to SSD upgrade.