WD M.2 Bottleneck ?

[Danni]

Hello Community, I recently moved over to pc gaming for long-term costs.

I implemented a WD 240GB Green M.2 Solid State Drive, and the read and write speeds I am managing to get off it from and too another device as well as just different directories on the M.2.

My Read / Write speeds when transferring one big file seem to not exceed between 80-130MB onto an external storage or on itself, now the M.2 is following the sata standard, however, it is capable of half a 1GB/s. However, in disk mark 5 I do get the sequential read and write of 500MB and 370MB. The confusing thing is also I do manage to get the speed, to begin with and then they drop down to about 100MB. What am I missing? Is there cache on the storage that gives the initial speed hence the slow down when it fills up or? Can a latency increase of up to a second cause the file transfer to stay low? I can not find the bottleneck please help.

 

System Specification:

 

- 8 gen i5-8400

- Asus 1050ti

- WD 240GB m.2 sata SSD

- Gigabyte Aorus Ultra Gaming (Ref 1)

- 8GB Vengence Ram

- Corsair VS450 Power Supply

 

Build Posted on PC Part Picker

https://uk.pcpartpicker.com/b/r4YTwP

[Danni]

1 minute ago, Pangea2017 said:

There are cheats used by the manufacturer. One of those is it to use a small part of the flash as "SLC" to get faster write speed in benchmarks. Other problem is on cheap drives that they getting slower if the drive fill up.

Also keep in mind that you are doing a read and write at the same time. If your partition is right and you use ahci then the drive is just this slow.

Are there any ways to get around the SLC, saying SLC is the first I have heard of it. What would my options be? If I bought another M.2 what should I do to avoid this ditch again?

My SSD is actually really new and has tons of storage left. Also, this doesn't explain the temporary high speed as advertised? 

Appreciate your help!

[dcgreen2k]

4 minutes ago, Danni said:

Are there any ways to get around the SLC, saying SLC is the first I have heard of it. What would my options be? If I bought another M.2 what should I do to avoid this ditch again?

My SSD is actually really new and has tons of storage left. Also, this doesn't explain the temporary high speed as advertised? 

Appreciate your help!

SLC means single-level cell, which means that it stores one bit per cell. It's an earlier technology, before MLC and TLC, but it can be much faster and more durable. I guess it does work as a cache.

[Danni]

1 minute ago, thegreengamers said:

SLC means single-level cell, which means that it stores one bit per cell. It's an earlier technology, before MLC and TLC, but it can be much faster and more durable. I guess it does work as a cache.

I thought that might be the case, so what would I need to do to get around this? How can I avoid this cheat when on the market because it did advertise the speeds of up to half a GB?

[Danni]

3 minutes ago, Pangea2017 said:

For Samsung SSD you can a just the size of the cache or tell the software to buffer in you RAM. 

Sadly you nealy never see that the product delivers what the manufacturer advertise.

 

If you realy need fast SSDs check meaningful reviews first or run your slow SSD in Raid 0.

 

They use cheap MCL, TLC which store many bits per cell but are slower. To compensate this they tell the controller to treat some MLC/TCL cells as SLC to get faster writes and clean this area after the file transfer is completed.

Epensiv drives use dedicated chips (flash, ram) for this task.

Look like I will need to invest in a Samsung SSD, is there any other brands which are known to give what they advertise? As I have seen some of the m.2 SSD prices to be very high. Running it in Raid 0 is a good call, although there isn't a performance increase until RAID 1 isn't there?

 

Appreciate the help.

[Danni]

8 minutes ago, Pangea2017 said:

this is the little trick

Just checking out Samsungs 960 evo m.2 NVME. Have you seen if the performance it gives is close to what it advertises with,  Read speed up to 3,200MB/s - write speed up to 1,500MB/s ?

[Danni]

3 minutes ago, Pangea2017 said:

Raid 1 is just a mirror. https://en.wikipedia.org/wiki/RAID

SSD are expensiv based on high demand for flash and expected to get slowley cheaper.

What do you wan't to do with the SSD? high IOPS, quee depth, ...?

if you demand the drive for longer time at full speed you need cooling or it will throtle

Not the best review and dont expect to see 2gB/s in windows file transfer: http://www.tomshardware.com/reviews/samsung-960-evo-nvme-ssd-review,4802-2.html

Perfect, thank you for your help, I have learnt a lot and appreciate you taking the time to help me with my issue.

[pyrojoe34]

39 minutes ago, Danni said:

Just checking out Samsungs 960 evo m.2 NVME. Have you seen if the performance it gives is close to what it advertises with,  Read speed up to 3,200MB/s - write speed up to 1,500MB/s ?

Yes, is exactly the speeds I get with mine... however, other than benchmarks (and things like simple file scans) you never see those speeds since the drive is not the bottleneck for most applications. Also with network transfers it doesn't matter at all since the max speed on a standard Gb connection is only like 120MB/s, not to mention that the speed of the other drive you are transferring to/from will also be a bottleneck unless both are high speed NVME drives. (transferring files from my SATA SSD to my NVME M.2 only me ~500+MB/s speeds because the SATA drive is the bottleneck.