@yourij
https://www.quora.com/Isn-t-the-PCIe-4-slot-backward-compatible-with-PCIe-2
Yes, PCIe 4.0 slots are backward compatible with PCIe 2.0 devices. This means that you can install a PCIe 2.0 card in a PCIe 4.0 slot, and it will function correctly. However, the card will operate at the maximum speed of PCIe 2.0, which is significantly lower than the speeds offered by PCIe 4.0.
Compatibility Overview:
PCIe 4.0 Slot: Supports PCIe 4.0, 3.0, 2.0, and 1.0 devices.
PCIe 2.0 Device: Will work in a PCIe 4.0 slot but at PCIe 2.0 speeds.
This backward compatibility is a key feature of the PCIe standard, allowing for a wide range of hardware to work together across different generations.
NVMe and PCIe are two different things.
I recently use the analogy that if PCIe is the road then NVMe is a type of car that can be driven on the road. You can drive a fast car on the road. You can drive a slow car on the road. You can drive a motorcycle on the road. You can drive a truck on the road.
Your problem with a road only becomes an issue when the capacity of the road is in question. If you have a fully loaded 18-wheeler with 80,000 lbs onboard, there are many roads you cannot (legally) use.
PCIe 4.0 has a max data rate of 1965MB/s per lane
PCIe 3.0 has a max data rate of 985MB/s per lane
PCIe 2.0 has a max data rate of 500MB/s per lane
NVMe is “non-volatile memory express” which is a designation of device that can operate on the PCIe superhighway.
For a while in 2017 cheap X2 (dual lane) NVMe drives became popular for a short time. These tended to be extremely slow and limited to 128GB for the most part. What is the point of a NVMe drive that is slower than a SATA drive? Needless to say, this “fad” was thankfully short-lived.
If you were to put an X2 drive on a PCIe 2.0 slot adapter, your max data rate would be 1000MB/s. Once you factor in the necessary 8b/10b line encoding, your data transfer for a drive like this would be a maximum of about 700MB/s—which is admittedly a trivial amount faster than the 560MB/s transfer rate of a SATA drive.
So basically in answer to your question, you can run a PCIe 3.0 drive on a PCIe 4.0 socket. And you can run a PCIe 4.0 drive in a PCIe 3.0 socket. In either case the drive will run at the slower 3.0 speed.
@yourij jeżeli to tylko tymczasowo, to pomysł wydaje się ok. Ale ChatGPT znalazł post mówiący, że to może nie zadziałać i zależy od adaptera. I mimo że fizycznie go wsadzisz, to może nie wykrywać urządzenia. Dla pewności lepiej sprawdzić czy jest kompatybilny lub kupić taki tylko PCIe 2.0 x1.
Źródło: https://www.elektroda.pl/rtvforum/topic4007808.html?utm_source=chatgpt.com
I P.S.: dysk będzie równie szybki co zwykłe HDD, przez ograniczenie PCIe 2.0 x1