On Sunday, 19 January 2020 3:47:00 PM AEDT Craig Sanders via luv-main wrote: > NVME SSDs are **much** faster then SATA SSDs. SATA 3 is 6 Gbps (600 MBps), > so taking protocol overhead into account SATA drives max out at around 550 > MBps. > > NVME drives run at **up to** PCI-e bus speeds - with 4 lanes, that's a > little under 40 Gbps for PCIe v3 (approx 4000 MBps minus protocol > overhead), double that for PCIe v4. That's the theoretical maximum speed, > anyway. In practice, most NVME SSDs run quite a bit slower than that, about > 2 GBps - that's still almost 4 times as fast as a SATA SSD. > > Some brands and models (e.g. those from samsung and crucial) run at around > 3200 to 3500 MBps, but they cost more (e.g. a 1TB Samsung 970 EVO PLUS > (MZ-V7S1T0BW) costs around $300, while the 1TB Kingston A2000 > (SA2000M8/1000G) costs around $160 but is only around 1800 MBps).
Until recently I had a work Thinkpad with NVMe. That could sustain almost 5GB/s until the CPU overheated and throttled it (there was an ACPI bug that caused it to falsely regard 60C as a thermal throttle point instead of 80C). But when it came to random writes the speed was much lower, particularly with sustained writes. Things like upgrading a Linux distribution in a VM image causes sustained write rates to go well below 1GB/s. The NVMe interface is good, but having a CPU and storage that can sustain it is another issue. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/ _______________________________________________ luv-main mailing list luv-main@luv.asn.au https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main
