Samsung 951 ACHI

[Syd]

Morning guys

Very long time no see.
2 young babies have taken over my life in the last few years and left me almost no time for my pc and old pals on HEXUS (and I know a lot of you are still here!)
But my beautiful Vapouriser (a 2 year build water cooled unit) has finally started to show its age and I recently complemented it with a devils canyon build. I have been slowly putting it together from old and new and recently got her comissioned. But I thought I would take advantage of the M2 slot and bought a 256gb sammy 951 AHCI pcie ssd. After a little bios tinkering I got her working, however when I ran magician last night it's only getting 770 sequential read and around 600 write. Now I must be missing something as my gigabyte gaming 7 1150 is supposed to support x4 on the M2 slot, so any suggestions?
I could get a lycom DT120, but that kinda defeats the object!!!!

Any guidance would be greatly appreciated !

[EndlessWaves]

A typical Z97 M.2 slot is limited to PCI-E 2.0 2x which is ~500MB/s each way so you've definitely got a faster slot.

I'm not familiar with magician but your speed results could be because that's as fast as it can manage on the particular test you're using.

If you bought the SM951 it's also known to overheat in some situations so it's worth checking the graph of the speeds. If it shows periods of higher speeds (around 1000MB/s or 2000MB/s depending on whether your M.2 slot is 2.0 or 3.0) then there's a good chance that may be what's happening.

[Syd]

Thank for your insight.
Would I be better testing with crystal Mark? Or is there a simpler Prog?

[SkyScape]

Not an expert by any means, but I downloaded hdtune for when I want to benchmark my 951. I have the ACHI version too, but am planning to return it for the NVMe version which I should have got in the first place.

How are you finding the real world performance compared to your replaced drive? Any noticeable/significant difference?

Edit: you might find the following link to be useful if you have not already optimized your system for SSDs: http://www.thessdreview.com/ssd-guid...ows-8-edition/

[SkyScape]

Did you check if any of the lanes used by your M.2 slot are shared, and if so, that you are not using another device in the ports that are shared with the M.2? Perhaps that could be the problem, although I suspect trying to share the same lane between two devices would cause a much more obvious problem.

On my mobo 2 out of 4 PCIe 3.0 lanes are shared with two of the SATA ports.

PS. Looks like I won't be returning the AHCI version after all after reading about how much fuss it is to get it working as a bootable drive with Win7!