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XPS 8700, Samsung 950 Pro, low performance
Hi, how are you?
I have an XPS 8700 with three storage units, 2 M2 SSDs and an HDD.
The main disk is a Samsung Evo 850 and the other SSD is a Samsung 950 Pro NVMe. When I have done the benchmark test the Evo 850 yields very high results, more than I would expect, however the 950 Pro qualifies well below the expected and this is the reason why I do not have it assigned as the main disk and it is connected to my PC through a SilverStone Technology SST-ECM20 Dual M2 to PCI-E X4.
I would like to know if someone finds any error in my configuration where this is happening.
Thanks and regards
Tesla1856
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December 30th, 2019 17:00
You're a good sport.
Looks about the same to me (same strangeness). So, it had nothing to do with Samsung Magician.
My take on this is that since both drives are connected through the SilverStone SST-ECM20 ... it is somehow (incorrectly) reversing-or-switching the drive identities.
The mSATA is still low for SATA-SSD but that might be the SSD itself or the SiverStone card (slowing it down). A more normal 2.5 inch SATA-3/600 SSD (connected directly to a motherboard SATA port) would likely be 2x faster.
And if those other numbers are true, they are crazy-good (if even possible). Again, might be the SilverStone card pulling that off, or on some Samsung drives, (IIRC) they can do some driver-trickery. Still, never seen one that fast.
XPS007
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January 4th, 2020 12:00
I have installed the 950 Pro EVO on my Latitude E7470 as a C disk and it is running pretty well so I think there was a problem with the PCIe adapter I was using in my XPS as you told me from the beginning and the Samsung 850 EVO works very well from the M2 slot so I consider the problem solved. I put the last Benchmarks of both machines.
950 Pro now on my Latitude E7470
850 EVO on my XPS
Cheers
Tesla1856
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December 29th, 2019 18:00
So, you got one of those NVMe SSD's on that PCIe card to be the bootable Windows drive C: ?
Anyway, PCIe x4 (slot and card) is good, but do you think it is enough bandwidth to run TWO NVMe SSDs at full speed ?
Isn't that old machine's version of PCIe one of the (older) slower versions ... like v2.0 maybe ?
Maybe try the 850-Pro by itself (on on it's own PCIe slot) ?
XPS007
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December 29th, 2019 20:00
Hi Tesla,
Thanks for your quick reply.
The 850 Evo is my bootable drive C and is working quite well connected through mSata slot. I just ask myself why the 950 Pro is not performing well through the PCIe x4. (Maybe it's a slower version like 2.0)
Anyway I don't understand too much of these things unfortunately
Tesla1856
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December 29th, 2019 21:00
1. OK, I understand now.
2. There are various reasons why.
But before all that ... why don't you tell us what Crystal DiskMark says the sequential r/w speed is on the 950-Pro-NVMe .
speedstep
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December 30th, 2019 10:00
There is no way you are getting 4766 from MSATA
so there's something wrong with the pictures.
https://crystalmark.info/en/
https://www.techspot.com/review/969-samsung-850-evo-m2-msata/page5.html
Tesla1856
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December 30th, 2019 11:00
Now that your first picture is finally approved and viewable to us ...
Like @speedstep says, those pics are very strange (in various ways).
I think either you or (that version of) Samsung Magician is confused about what is inside that machine, and how they get measured.
Vic384
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December 30th, 2019 13:00
Based upon the posted image from Samsung Magician it appears to be an older version of the program. The version (6.0.0) I have does not look like that.
XPS007
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December 30th, 2019 13:00
Lol.. you're right, that's why I opened this query, those benchmark numbers are crazy
Tesla1856
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December 30th, 2019 14:00
Well, I think we all appreciate your confidence in us, but we are not Samsung support. I don't even have Samsung Magician installed anywhere. Your version of Samsung-Magician seems to be having trouble analyzing your (rather old) hardware.
Two of now have mentioned Crystal Disk-Mark . As for the other things, I just use Crystal Disk-Info or Windows.
XPS007
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December 30th, 2019 15:00
Yes, now I have tried to do a test with Crystal Disk-Mark and there seems to be more congruence although I honestly do not know the proper way to interpret these numbers
XPS007
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December 30th, 2019 18:00
I have uninstalled the 950 Pro NVMe to see what happens with the EVO 850 and these are the results of the new Benchmark test
FeelTheThunder
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June 29th, 2022 07:00
I don't know whats up with your msata speeds, they look x 10. They should only be around 500 not 5000.
The problem I have found out with the x4 slot on the xps8700 motherboard is it is only a x1 speed. Even though the board clearly shows the x4 slot as pci-ex4 it is actually a x1. (manual says pci-ex1_4)
I am not sure if it is pcie ver 3.0 as is the 16x slot. it may only be 2.0 or even 1.0
a 3.0 x 1 slot technically should have a throughput of .985 gb/s a 2.0 is .500 gb/s and a 1.0 is .250 gb/s
you are getting 1 x 1.0 speeds on your nvme.
Here is my 850 msata on an Alienware 18
FeelTheThunder
15 Posts
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June 30th, 2022 09:00
The high numbers for your msata are from Samsung Magician. I remember that from my experience a while back, I never use it anymore.
Your numbers are correct for the x4 slot on the xps8700, I tried my XPS8700 with the same results, why Dell put a 4x slot with only 1x electrical and pcie ver 2.0 is beyond me. With ver 2.0 x 1 I should have got more like 500 but only got 200 for some reason.
Here are my recent results with a Rivo m2 pcie x4 card adapter with an EVO970 plus on an old Gigabyte x79-ud3 board on a pcie 3.0 16x slot (8x electrical). Amazing.