External nvme slow speeds

[monopoly]

MacBook Pro 16" M1 Pro

Hi I have just bought a 2tb Samsung 970 Evo Plus and using it in an external enclosure (has tons of reviews saying it's fast).

I'm getting approx 700 read and wrote when the drive is capable of 3600 read and write.

Any ideas?

 

[sgtaylor5]

Which External Storage?

 

[Mike Boreham]

....and what cable ?

3600 needs a Thunderbolt enclosure and Thunderbolt cable.

 

[monopoly]

This one..

Deal: Sabrent USB 3.2 Type-C Tool-Free Enclosure for M.2 PCIe NVMe and SATA SSDs (EC-SNVE) https://www.amazon.co.uk/dp/B08RVC6..._dl_79CJ01XC986N23N4EW6E?_encoding=UTF8&psc=1

 

[Mike Boreham]

That enclosure is USB 3.2, not Thunderbolt, and as it says "up to 1000MB/s".... The key words being "up to".

700 MB/s is reasonable.

 

[joevt]

That enclosure is USB 3.2, not Thunderbolt, and as it says "up to 1000MB/s".... The key words being "up to".

700 MB/s is reasonable.

Even a relatively slow NVMe should get 1000 MB/s on an Intel Mac via USB. I have an Intel 660p which is limited to 813MB/s because it's connected to a ASMedia ASM1142 which is limited by 8 Gbps PCIe 2.0 x2 connection. When it's connected to a Thunderbolt controller (PCIe 3.0 x4), it can do USB up to 1000 MB/s.

M1 Macs have an issue with USB speeds but there may be workarounds.
https://forums.macrumors.com/thread...ally-10gb-s-also-definitely-not-usb4.2269777/

 

[Gnattu]

Even a relatively slow NVMe should get 1000 MB/s on an Intel Mac via USB. I have an Intel 660p which is limited to 813MB/s because it's connected to a ASMedia ASM1142 which is limited by 8 Gbps PCIe 2.0 x2 connection. When it's connected to a Thunderbolt controller (PCIe 3.0 x4), it can do USB up to 1000 MB/s.

M1 Macs have an issue with USB speeds but there may be workarounds.
https://forums.macrumors.com/thread...ally-10gb-s-also-definitely-not-usb4.2269777/

Best workaround: use Thunderbolt

 

[Mike Boreham]

Even a relatively slow NVMe should get 1000 MB/s on an Intel Mac via USB. I have an Intel 660p which is limited to 813MB/s because it's connected to a ASMedia ASM1142 which is limited by 8 Gbps PCIe 2.0 x2 connection. When it's connected to a Thunderbolt controller (PCIe 3.0 x4), it can do USB up to 1000 MB/s.

M1 Macs have an issue with USB speeds but there may be workarounds.
https://forums.macrumors.com/thread...ally-10gb-s-also-definitely-not-usb4.2269777/

Yes OK but in this case, even the manufacturer is only claiming up to 1000MB/s. "Reasonable" probably wasn't the best word, but my experience is usually less than the manufacturer's claim so not surprised.

 

[QuietOC]

FWIW: there is also an issue with that particular drive and Thunderbolt writes. You might want to return both items.

 

[monopoly]

FWIW: there is also an issue with that particular drive and Thunderbolt writes. You might want to return both items.

Just plugged it into my mates windows machine and it's getting 3500mb read and write so definitely something to do with it and macOS

 

[Mike Boreham]

Just plugged it into my mates windows machine and it's getting 3500mb read and write so definitely something to do with it and macOS

Something is not right here. You cannot get 3500MB/s from USB even 3,2, on Windows or Mac.

Quote from your link:

• PLUG & PLAY: No additional drivers required. Bus powered. Does not need an external power supply. Perfect for tech nerds, 4K content designers, and engineers. At up to 1000MB/s, Data copy and transferring will be done in in no time.

I think (can't find link at present) that Sabrent do some enclosures which are dual Thunderbolt/USB, but that isn't what you linked, but maybe what you have?

EDIT I think this is the dual mode (TB3 and USB) enclosure I had seen, but Trebleet not Sabrent as I thought.

 

[QuietOC]

Just plugged it into my mates windows machine and it's getting 3500mb read and write so definitely something to do with it and macOS

It is same on MacOS or Windows. It would work fine plugged internally to PCIe on a Mac. For whatever reason writes are slow when it is connected via Thunderbolt to any system. Windows is actually much slower by default because Microsoft disables write caching for removable drives. MacOS is not the issue.

 

[Mike Boreham]

It is same on MacOS or Windows. It would work fine plugged internally to PCIe on a Mac. For whatever reason writes are slow when it is connected via Thunderbolt to any system. Windows is actually much slower by default because Microsoft disables write caching for removable drives. MacOS is not the issue.

That may be the case but is not relevant when put in a USB enclosure. 1000MB/s max, 700MB/s real world, Link