6,1 - Installed Samsung 970 Pro 1TB, is there a simple reason why I dont see a huge transfer speed?

[Messy]

https://imgur.com/sLGTm7Z

^ Speed

Any reason why I don't see even close to the rated speed that these drives can put out? I'm sure there's a simple explanation presumably something to do with lanes and such.

If someone could just clear that up for me I'd be grateful. Seems a shame to have such a high spec drive and not be able to take advantage of the speed.

 

[tsialex]

https://imgur.com/sLGTm7Z

^ Speed

Any reason why I don't see even close to the rated speed that these drives can put out? I'm sure there's a simple explanation presumably something to do with lanes and such.

If someone could just clear that up for me I'd be grateful. Seems a shame to have such a high spec drive and not be able to take advantage of the speed.

You are limited with PCIe 2.0 speeds and just 4 lanes, so maximum throughput possible after overhead is just around 1500MB/s.

Look here:

You can get the full diagram here: Did someone say block diagram?

 

[Messy]

Cheers, as I suspected. What a shame, that's quite the way to cripple the speed.

 

[saulinpa]

It was state of the art 6 years ago. One of many reasons people are pushing for a refreshed MP.

 

[Messy]

So a bit of an update, i'm now getting very poor speeds.

Anyone shed any light on this?

https://i.imgur.com/JEVNCxr.png

[doublepost=1555425704][/doublepost]Hmm, am I right in seeing that this is only using 2 lanes now?

 

[axrst]

Link speed it's x2 not x4. What pcie adapter do you use? Todoay, I installed my 970 evo 1TB and I'm getting 1500+ speeds on both read and writing. I use the Aqua Computer kryoM.2 evo PCIe 3.0 x 4, adapter.

See this: https://forums.macrumors.com/threads/blade-ssds-nvme-ahci.2146725/

 

[Messy]

Link speed it's x2 not x4. What pcie adapter do you use? Todoay, I installed my 970 evo 1TB and I'm getting 1500+ speeds on both read and writing. I use the Aqua Computer kryoM.2 evo PCIe 3.0 x 4, adapter.

See this: https://forums.macrumors.com/threads/blade-ssds-nvme-ahci.2146725/

Yes I can see it's x2, not x4 which is why it's slow.

I have been using https://www.amazon.co.uk/gp/product/B01CWWAENG/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1

In my OP it was running at full x4 speed.
[doublepost=1555427419][/doublepost]

Link speed it's x2 not x4. What pcie adapter do you use? Todoay, I installed my 970 evo 1TB and I'm getting 1500+ speeds on both read and writing. I use the Aqua Computer kryoM.2 evo PCIe 3.0 x 4, adapter.

See this: https://forums.macrumors.com/threads/blade-ssds-nvme-ahci.2146725/

Also... that's not on a 6,1 is it?

 

[axrst]

No, my cMP it's 5,1

 

[Messy]

No, my cMP it's 5,1

Maybe worth replying to a thread that's more relevant to you then?
[doublepost=1555429234][/doublepost]@tsialex any ideas on this, gone from x4 to x2, no change in setup.

 

[tsialex]

@tsialex any ideas on this, gone from x4 to x2, no change in setup.

1. Bad connection on the adapter connector, clean it and check for oxidation.
2. Bad connection on the GPU, test with the original Apple SSD.
3. Defective adapter, check with a new adapter.
4. Defective M.2 blade, test the 970 Pro with another PC/MP5,1 that don’t need the Apple M.2 to standard M.2 adapter.

 

[Messy]

1. Bad connection on the adapter connector, clean it and check for oxidation.
2. Bad connection on the GPU, test with the original Apple SSD.
3. Defective adapter, check with a new adapter.
4. Defective M.2 blade, test the 970 Pro with another PC/MP5,1 that don’t need the Apple M.2 to standard M.2 adapter.

Well well well, very strange.

I tore down the Mac, removed the PSU, both graphics cards, removed the RAM and SSD and then cleaned everything out using a can of air and reassembled...

Now I have x4 speed! It's likely the Chinese Sintech adapter I would think as everything else just sits there not doing much.