Just fitted a Samsung M.2 SSD and disapointed

I hear what your saying Money is getting tighish having just built a new PC and bought a new monitor

So looking at the 256 drives, to me, there seems very little between the 950PRO and the SM951 apart from price
 
cms239 said:
I am getting confused

You say I want the NvMe version of the 951 and not the AHCI however between them there is only a small difference is speed

NVMe = Read 2000MB/s, Write 650MB/s, 300k/83k IOPS
AHCI = Read 2000MB/s, Write 600MB/s, 140k/40k IOPS

What is interesting is moving to 256GB there is a big hike in the write speed
Click to expand...

You need to look at the iops figures - over twice the performance with the NVMe drive - that is what counts.
 
cms239 said:
I am getting confused

You say I want the NvMe version of the 951 and not the AHCI however between them there is only a small difference is speed

NVMe = Read 2000MB/s, Write 650MB/s, 300k/83k IOPS
AHCI = Read 2000MB/s, Write 600MB/s, 140k/40k IOPS

What is interesting is moving to 256GB there is a big hike in the write speed
Click to expand...

There's quite a substantial difference in the IOPS figures. NVMe is about lower latency and efficiency, not about increasing raw MB/sec throughput. There's more to performance than just the MB/sec figures :)
 
Broken Hope said:
I don't think you can install the Samsung NVMe driver on that one which helps increase performance.
Click to expand...
FFS, where are these drivers.

Its a bloody minefield and starting to wish I had not bothered :(

Edit: Just seen this, last post is interesting - http://www.tomshardware.co.uk/answers/id-2849219/samsung-sm951-nvme-950-pro.html#17080205

So from what I can glen the one I have ordered and the Pro are very similar however the Pro is full retail with 5 year Samsung Warranty and the sm951 is OEM with only retailer warranty

This is also interesting - http://ssd.userbenchmark.com/Compar...Samsung-950-NVMe-PCIe-M2-256GB/m30950vsm38570
 
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I got the new SSD and the write speed is 850 and Read speed is 750, so still not up to spec.

I am starting to thing the problem is with the mobo not supporting the higher bandwidth - Intel X99 GA-X99-Gaming 5 PCIe Gen2 x2 & SATA3 . I fear its the Gen2 bit that tells the storey ie only 10gb/sec bandwidth and the SSD needs Gen4 32 32gb/sec to work at its best?

Any thoughts?
 
Overclockers, Mathew, to the rescue.

Had a very helpful conversation with Mather in customer services.. He has a Z97 mobo with a M.2 on board slot and same SSD. He ran a speed test, using CrystalDiskMark and got about the same results as me. He then run a prog he uses to test disk speed called Parkdale. He got write speed of about 600 and read of about 500. I downloaded and ran this prog while I was on the phone and got a write speed of 22.5!!!. At this point he suggested the ssd was faulty. We went on to discuss the Mobo M.2 slot and he checked the spec and concluded, like me, that it was only running at x2.

So, very kindly, he is posting out one of these - https://www.overclockers.co.uk/asus-hyper-m.2-x4-pci-e-mini-adapter-card-black-pcb-hd-032-as.html - to try, before we condemn the ssd.

Thanks Mathew, I assume you sometimes get the time to read the forum :)
 
Interesting:


I sent an email to Gigabyte re this and got this reply:


Hello,

M.2 SSD will only operate with PCIE Gen2.

If M.2 SSD installed on a PCIE to M.2 SSD adapter card, it is able to run with PCIE Gen3 and operate with reading speed about 2000MB/s.

Can you believe a new X99 mobo and the M.2 slot only operates at PCIe Gen 2. There are currently only two X99 Micro ATX boards, Gigabyte and Asrock and got the one that cant support Gen3 .. :rolleyes:
 
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You are better of using an m.2 Adapter card like the ASUS hyper even if you have a M.2 built on to the motherboard with 4x lanes. I found them to be more efficient and less glitchy and a little faster.
 
I think all gigabyte x99 boards only support the slower speeds. That is why I chose the Asus board for my build to get the full speed for m.2

these are the speeds you should see if you have a full speed m.2 slot


image uploading site
 
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Well some things you only find out after you have bought them and as I wanted a X99 Micro ATX the chaoice was limited. Asus now have a board but its quite a bit more.

However I have now fitted the Asus M.2 PCIe board that Mathew sent me and here are the results. Much better but possibly need tweeks to get 2000 Reads

 
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