[PaulKeeble]

Hard drives are still about 150MB/s.

SATA SSDs are limited to 550MB/s.

PCI-E 3.0 SSDs more like 3500 MB/s.

PCI-E 4.0 SSDs are 7000MB/s.

All of these are at consumer level pricing, you can get 2TB of PCI-E 4 from Western Digital for £130 at the moment, usually about £180. The issue is sustained writes more than reads for consumer verses enterprise drives where the speed drops off due to a lack of SLC caching and lack of cooling and TLC/QLC which is slower for sustained writing.

The example given is very much a consumer level device and not a particularly quick one by today's standards. You can also expect much faster reads cached than that on a DDR5 system I suspect.

[Dalewyn]

It should be noted that those SSD speeds are all protocol limits rather than NAND flash limits. ~7GB/s is literally the maximum speed PCIE4 can provide, likewise ~3.5GB/s for PCIE3 and ~500MB/s for SATA3.

[omgtehlion]

> the maximum speed PCIE4

4-lane PCIe, as most nvme drives are. I havent seen drives with wider lanes though...

[Dalewyn]

Ah, right. Lanes. I should have mentioned those as well, thanks for catching that.

[js4ever]

For me main difference between hdd and nvme is not really the throughput but the acces time. When you manipulate small files it's a lot more important

[bluedino]

Todays large hard drives are over 250MBs in sequential operations