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[Official] Samsung SM951 Owners Club - Page 77

post #761 of 1390
Quote:
Originally Posted by DS4130 View Post

I was under the impression PCIe gen2 offered 500MBps per lane, before overhead. Believe the overhead is fairly high on 2.0 and think your numbers look as expected..

Thanks everyone for your import. After some investigating / testing, I have found the culprit. First, the maximum potential throughput of a PCIe 2.0 lane is 500MBs after overhead. Here's a good article that details PCIe caps: http://www.tested.com/tech/457440-theoretical-vs-actual-bandwidth-pci-express-and-thunderbolt/

So IF the maximum potential of a four PCIe 2.0 lanes could be reached, you would expect a limit approaching 2000 MBs. However, there is one factor in this equation that I did not originally consider: the software. In this case, the software is the NVME driver, which is responsible to compressing data to / from the SM951. That overhead is reducing the overall throughput. To verify this, I overclocked / locked my CPU at 4.2 GHz, and my sequential read climbed to about 1430 MBs. I then underclocked / locked my CPU to .8 GHz, and my sequential read dropped to 1150 MBs.

Oh, well. I can deal with 1350 MBs for now. That limit will just give me motivation to upgrade in another year. smile.gif
post #762 of 1390
Oh, does anyone know of any alternative NVMe drivers to the Samsung and Microsoft drivers? I would like to see if there is a driver that is better optimized for handling compression.
post #763 of 1390
Quote:
Originally Posted by WJames View Post

Thanks everyone for your import. After some investigating / testing, I have found the culprit. First, the maximum potential throughput of a PCIe 2.0 lane is 500MBs after overhead. Here's a good article that details PCIe caps: http://www.tested.com/tech/457440-theoretical-vs-actual-bandwidth-pci-express-and-thunderbolt/

So IF the maximum potential of a four PCIe 2.0 lanes could be reached, you would expect a limit approaching 2000 MBs. However, there is one factor in this equation that I did not originally consider: the software. In this case, the software is the NVME driver, which is responsible to compressing data to / from the SM951. That overhead is reducing the overall throughput. To verify this, I overclocked / locked my CPU at 4.2 GHz, and my sequential read climbed to about 1430 MBs. I then underclocked / locked my CPU to .8 GHz, and my sequential read dropped to 1150 MBs.

Oh, well. I can deal with 1350 MBs for now. That limit will just give me motivation to upgrade in another year. smile.gif
PCIe 2.0 throughput is 500MB/s BEFORE overhead. It has about a 20% loss of bandwidth due to overhead (8/10 bit encoding). Real world performance is typically around 400MB/s. So looking at a PCIe 2.0 x4 connection your potential is up to about 1,600MB/s. Factor in that AS SSD usually shows lower performance and the system isn't optimized for benchmarking and you can see your results are fine. If you want to see the best performance out of your drive you need to optimize the system for benchmarking storage and learn how to use Iometer.
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post #764 of 1390
the option in this menu:



is disabled and grey out:



I always tought that after installing an NVMe device that option would be enabled, but not, it's still disabled.
is it enabled on your x99?
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post #765 of 1390
Quote:
Originally Posted by sblantipodi View Post

the option in this menu:



is disabled and grey out:



I always tought that after installing an NVMe device that option would be enabled, but not, it's still disabled.
is it enabled on your x99?
i don't have an Asus mobo. You can disable all power savings features in the CPU Config tab tho.
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post #766 of 1390
Quote:
Originally Posted by Sean Webster View Post

i don't have an Asus mobo. You can disable all power savings features in the CPU Config tab tho.

ok thank you smile.gif
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post #767 of 1390
Enabled for me with a Rampage V Extreme (X99) smile.gif
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post #768 of 1390
Quote:
Originally Posted by tistou77 View Post

Enabled for me with a Rampage V Extreme (X99) smile.gif

can you post a screenshot of that menu please?
thanks smile.gif
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post #769 of 1390
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tistou's config
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Mod Pump Ek Waterblock Koolance 390i Ek Wterblock PCH + MOS Waterblock Koolance GTX 1080 
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post #770 of 1390
Quote:
Originally Posted by tistou77 View Post


thank you, any idea why my X99 Deluxe does not show drive info there?
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Samsung 950 PRO NVMe M.2 512GB Samsung 850 EVO 1TB Western Digital Black 2TB Corsair Force GT 240GB 
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Hard DriveHard DriveHard DriveHard Drive
Samsung 950 PRO NVMe M.2 512GB Samsung 850 EVO 1TB Western Digital Black 2TB Corsair Force GT 240GB 
Optical DriveCoolingOSMonitor
Plextor PX-B320SA Blu-ray Corsair H80i AIO Windows 10, CentOS 7 EIZO S2433W 24.1" 1920x1200 60Hz 
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