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[Official] Samsung SM951 Owners Club - Page 76

post #751 of 1390
Quote:
Originally Posted by LaRock0wns View Post

I compared the sm951 NVMe 512GB vs the 950 Pro 512GB

First, the 950 Pro runs a lot cooler. At peak during the test, it hit 76C whereas the sm951 was hitting 90C without heatsinks and 72C with heatsinks. Also want to note that the Temp info and SMART info shows up for the 950 Pro in the latest AIDA64 Beta 5.50.3627

I ran 100MB and 1GB 5 pass tests on each drive, same exact OS setup (HD was cloned). The first test on the 950 Pro was without the Samsung NVMe driver, and the 2nd test was with it.

I am still trying to track down why my sequential read benchmark on AA SSD is only around 1350 with my SM951 NVMe. Are the results posted above on Windows 10? If so, are you using the Intel chipset drivers or the default Windows drivers?
post #752 of 1390
Quote:
Originally Posted by WJames View Post

I am still trying to track down why my sequential read benchmark on AA SSD is only around 1350 with my SM951 NVMe. Are the results posted above on Windows 10? If so, are you using the Intel chipset drivers or the default Windows drivers?

It was on Windows 10 Pro with the default MS driver from 2006, running on a gigabyte z170x gaming g1 board with full PCI-e bandwidth available to the m.2 slot. Intel chipset drivers are installed
post #753 of 1390
Quote:
Originally Posted by tistou77 View Post

Now you have which driver with the SM951?

The Samsung driver is better than Microsoft?

Otherwise, I hesitate to replace the SM951NVMe 256GB by the 950 Pro 512GB
Performance level (and temperature), it's "like" or 950 Pro is better?
Quote:
Originally Posted by WJames View Post

I am still trying to track down why my sequential read benchmark on AA SSD is only around 1350 with my SM951 NVMe. Are the results posted above on Windows 10? If so, are you using the Intel chipset drivers or the default Windows drivers?
Then you do not have enough bandwidth in pci-e slot. Using pci-e x4 2.0 ?

For max performace you need pci-e 3.0 x4.
post #754 of 1390
You can check what Nizzen said by a program that shows which pci-e is occupied and in what speed is running, for example AIDA64.
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post #755 of 1390
Thanks all for the feedback on the SM951 512 GB read benchmark. The x4 PCIe lanes are version 2. However, the theoretical maximum after overhead is still 2000 MB, so I wonder why I am only seeing around 1350 with AA SSD. *Shrug*
post #756 of 1390
Quote:
Originally Posted by WJames View Post

Thanks all for the feedback on the SM951 512 GB read benchmark. The x4 PCIe lanes are version 2. However, the theoretical maximum after overhead is still 2000 MB, so I wonder why I am only seeing around 1350 with AA SSD. *Shrug*

What MB do you have and what do you have connected to the pci-e slots?
post #757 of 1390
Quote:
Originally Posted by Nizzen View Post

What MB do you have and what do you have connected to the pci-e slots?

The MB is a Clevo P750/P770ZM - a laptop board. The PCIe ports/lanes are occupied as follows:

x16 GTX 980
1 x2 Empty M.2
3 x1 Realtek Card Reader
4 x1 Killer Wireless & Realtek Ethernet
5 x4 M.2 - SM951 NVMe 512 GB

The motherboard is based upon the Z97 Intel chipset. Thus, the 16 version 3 PCIe lanes supplied by the CPU are reserved for the GTX 980, and the 8 version 2 PCIe lanes provided by the chipset are applied to other components.

I am using a modded BIOS that allows disabling PCIe ports, so for testing purposes, I disabled ports 1, 3, and 4. The AA SSD benchmark remained unchanged at about a 1350 MBs sequential read.

Any suggestions on what I might try next?

Thanks again.
post #758 of 1390
The max you'll see with PCI-E v2.0 x4 is something around this :




Samsung SM951 512GB + HyperX Predator adaptor @ PCIExpress 2.0 x16 slot (used x4)


or





same used in an older system (AMD)


The rest of bandwidth up to 2000MB/s is lost due to read/write overhead and/or weak processor. You may see a tad higher numbers if you disable all power saving features and clock your cpu a bit.
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post #759 of 1390
Quote:
Originally Posted by WJames View Post

The MB is a Clevo P750/P770ZM - a laptop board. The PCIe ports/lanes are occupied as follows:

x16 GTX 980
1 x2 Empty M.2
3 x1 Realtek Card Reader
4 x1 Killer Wireless & Realtek Ethernet
5 x4 M.2 - SM951 NVMe 512 GB

The motherboard is based upon the Z97 Intel chipset. Thus, the 16 version 3 PCIe lanes supplied by the CPU are reserved for the GTX 980, and the 8 version 2 PCIe lanes provided by the chipset are applied to other components.

I am using a modded BIOS that allows disabling PCIe ports, so for testing purposes, I disabled ports 1, 3, and 4. The AA SSD benchmark remained unchanged at about a 1350 MBs sequential read.

Any suggestions on what I might try next?

Thanks again.
Laptop...

Buy x99 and 5930k, and you have enough pci-e lanes. If you need full performance wink.gif
post #760 of 1390
Quote:
Originally Posted by WJames View Post

The MB is a Clevo P750/P770ZM - a laptop board. The PCIe ports/lanes are occupied as follows:

x16 GTX 980
1 x2 Empty M.2
3 x1 Realtek Card Reader
4 x1 Killer Wireless & Realtek Ethernet
5 x4 M.2 - SM951 NVMe 512 GB

The motherboard is based upon the Z97 Intel chipset. Thus, the 16 version 3 PCIe lanes supplied by the CPU are reserved for the GTX 980, and the 8 version 2 PCIe lanes provided by the chipset are applied to other components.

I am using a modded BIOS that allows disabling PCIe ports, so for testing purposes, I disabled ports 1, 3, and 4. The AA SSD benchmark remained unchanged at about a 1350 MBs sequential read.

Any suggestions on what I might try next?

Thanks again.


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..
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