Your speed? WD BLACK SN750

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1

To friends who own the WD SN750.

How is your product in terms of reading and writing speed?

Can anyone have an average of 3,000 mb / s?

I can only reach half of that and have tried everything. Looking at UserBenchmarks 1700mb / s it seems to be the average "

Is that correct?

2

Nice, but does your motherboard support full speed of PCIE 3.0 x4 nvme drives?

3

Yes, i have support for M.2 PCIe x4 on the motherboard (TUF H310M-PLUS).

4

Wow, looks good to me … the motherboard, not the performance of the SSD.

I’m getting a sequential reading speed of 3524 MB/s and a write speed of 3225 MB/s with a Samsung 970 EVO Plus 1 TB SSD on a very simple Dell Optiplex 7070 SFF computer with a i7-9700 Intel CPU and 32 GB RAM-memory.

No, it’s not a WD SSD, but that is just a personal choice after many small problems in the past with WD SSD drives.
Samsung … better performance, better software, less troubles.

5

With your question, I got a coffee and researched the subject on this beautiful sunny Sunday morning.

I found that my motherboard has the following specification “PCIE 2.0 x4 & SATA)”.

I think I may have a problem here.

6

Yep … I was not looking good to the specifications.

1 x M.2 Socket 3, with M Key, type 2242/2260/2280 storage devices support(both PCIE 2.0 x4 & SATA mode)*1
4 x SATA 6Gb/s ports (gray),

1 Like
7

You found your bottleneck. The specs say:

With x4 PCI Express® 2.0 bandwidth, M.2 supports up to 20Gbps data-transfer speeds.

At 1700mb / s you pretty much maxed out the the PCIE 2.0 x4 lanes. (I suppose the missing 300mb / s are used by data framing overhead* (headers etc.).)
You might as well have bought yourself a lower spec’ed NVMe SSD. Ah well, might you ever upgrade to a new MB then your SSD is up to it.

In the specs I do see a:

1 x PCIe 3.0/2.0 x16 (x16 mode)

If it’s not in use (by a discrete video card), you might add a 4 lanes M.2 to PCIe converter card to put your NVMe drive in order to enjoy its full speed.

(This one works good and costs little.)

* To determine the actual amount of data that can be transferred, the encoding technique must be understood. PCIe Gen 3.0 and PCIe Gen 4.0 use a 128b/130b encoding technique. Older generations such as PCIe Gen 2.0 use 8b/10b encoding. This encoding technique (PCie 4.0) transforms 128-bit data into 130-bit line code. This allows for reasonable clock recovery (which is the process of extracting timing information from a data stream) and ensures alignment of the datastream. Source

For PCIe 2.0:
5GT/s * (8b/10b) = 4.000Gbps
4.000 Gbps / 8 b/Byte = 500 GB/s (per lane)
Overhead: ([10b-8b]/10b)*100 = 20%

1 Like
8

Hi, Marty.

Exactly.
I took it out of my computer and put it on my Dell I5, which has PCIe 3.0.

Using Crystal the SSD reached the reading speed of 3500mb without any problem.

I was unlucky enough to buy the only motherboard (TUF H310M-PLUS) which is PCIe 2.0 haha. It is a recent card, but they are rare on the market, costing the same price as other 3.0.

I believe that this problem that I had will be increasingly rare.

Thanks to all friends for the topic.

9

Just found this thread when doing a search for UserBenchmark. Like you @Hermman, I am getting top performance on Crystal benchmark and around 1800 on UserBenchmark. :confused:
How can there be that much difference? Which one is right? :person_shrugging:t2: