Samsung 950 Pro, super slow direct read and write

[Slind14]

Hey,

I have the Samsung 950 Pro and when running the Samsung Magician benchmark its direct read and write is reported to be extremely slow. The SSD is connected with a Delock 89455. What could that be as the sequential read/write is normal:

for comparison a 840 EVO connected via. SATA

 

[popatim]

Which motherbd do you have and which slot is this adapter plugged into?

Also, I cant see the images from work, what speeds are you getting if you dont mind.

 

[Slind14]

Its a Gigabyte Z87X-D3H and it is plugged into the x8 slot while the adapter only utilizes x4 but is giving 39 Gbps per second according to the technical data.
There is only one graphics card so the E3-1270v3 should have enough channels, too.

The speeds are:
Seq. Read 2521 (advertised with up to 2500)
Seq. Write 1531 (advertised with up to 1500)
Direct Read 22482 (advertised with up to 300000) -> less than a tenth
Direct Write 24288 (advertised with up to 110000)

The SATA SSD as comparison is at around 500 Seq read/write and at 23419/27533 direct read/write, so achieving better results although its advertised with way less, rapid mode is not in use and has already +14 TB data flow.

Both drives have a cap of 500 GB with +150 GB free.

 

[cadkiwi]

Hello,

my benchmark with my 950pro looks exactly the same!
Normal sequentials but random only 1/10th of the max!

I am running on M.2 slot on MoBo (Asus Sabertooth z170 Mark I)
I installed the driver and otherwise everything looks ok!
I also used crystaldisk benchmark and set to 32/4 but also there way too low values.

 

[Ronshere]

Your motherboard only has 1 x PCI Express x16 slot, running at x4 (PCIEX4)

From your mobo's specs:
* The PCIEX4 slot shares bandwidth with all PCI Express x1 slots. All PCI Express x1 slots will become unavailable when a PCIe x4 expansion card is installed.
* When installing a x8 or above card in the PCIEX4 slot, make sure to set PCIE Slot Configuration in BIOS Setup to x4.
3 x PCI Express x1 slots
(The PCIEX4 and PCI Express x1 slots conform to PCI Express 2.0 standard.)
1 x PCI slot

So the slot you plugged your adapter with the 950 Pro in is running at x1, not x4 so you are being throttled right there.

http://www.gigabyte.com/products/product-page.aspx?pid=4518#sp



the 950 Pro is a PCI Express 3.0 device but the slot it is in is running at PCI Express 2.0

PCIe 2.0 - 500MB/s per lane

You mobo specifications state (The PCIEX4 and PCI Express x1 slots conform to PCI Express 2.0 standard.)

your 950 Pro can not possibly reach its top performance levels.