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post #561 of 1906
Hi guys,

I just installed my new motherboard and Samsung 950 Pro and i am not that happy with the performance to be honest..

can it be that i am using an AMD system? Here are my scores:





I also saw that i only have a link speed of 5 gbps? On the motherboard i read 20 gbps, so theoretical i should get at least 10 gbps link speed..


Any information is welcome thumb.gif
Edited by hurricane28 - 1/27/16 at 2:51pm
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post #562 of 1906
Quote:
Originally Posted by hurricane28 View Post

Hi guys,

I just installed my new motherboard and Samsung 950 Pro and i am not that happy with the performance to be honest..

can it be that i am using an AMD system? Here are my scores:

I also saw that i only have a link speed of 5 gbps? On the motherboard i read 20 gbps, so theoretical i should get at least 10 gbps link speed..


Any information is welcome thumb.gif

Most likely cuz its AMD, i didn't even know they had NVME ready boards yet.
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post #563 of 1906
Quote:
Originally Posted by hurricane28 View Post

Hi guys,

I just installed my new motherboard and Samsung 950 Pro and i am not that happy with the performance to be honest..

can it be that i am using an AMD system? Here are my scores:





I also saw that i only have a link speed of 5 gbps? On the motherboard i read 20 gbps, so theoretical i should get at least 10 gbps link speed..


Any information is welcome thumb.gif

You're maxing out 2 lanes worth of PCIe 3.0. So yes, linking at 5 Gbps is the reason the sequential performance is where it's at. There can be quite a few reasons for this. What do you have installed in the system, if anything beyond your Nvidia GPU and the SSD? Not knowing the Asus 990FX motherboard, it's hard to say without diving into it with knowledge of what you have installed.
Edited by mypickaxe - 1/27/16 at 6:30pm
post #564 of 1906
Quote:
Originally Posted by mypickaxe View Post

You're maxing out 2 lanes worth of PCIe 3.0. So yes, linking at 5 Gbps is the reason the sequential performance is where it's at. There can be quite a few reasons for this. What do you have installed in the system, if anything beyond your Nvidia GPU and the SSD? Not knowing the Asus 990FX motherboard, it's hard to say without diving into it with knowledge of what you have installed.

I don't have PCIe 3.0 unfortunately..

I am also not running the Sabertooth but an Gigabyte 990 FX Gaming G1 motherboard. I connected it to the M.2 slot.

Strange thing is, is that in BIOS i don't get Nvme options so i cannot configure it but it does see it in windows and the installation went flawlessly. I installed the Samsung driver and everything in Windows is detecting the drive, but the boot times are rather slow compared to my Samsung 850 Pro..

On the other hand, the IOPS seems rather low too compare to the read and write speeds i am getting. I was looking on the Internet about this and i saw that one guy with the same CPU and chipset was getting much higher IOPS, like 65% higher so i guess i am trottling down on something.

I already disabled all the power saving features in BIOS and Windows.
Edited by hurricane28 - 1/27/16 at 11:57pm
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post #565 of 1906
Quote:
Originally Posted by hurricane28 View Post

Quote:
Originally Posted by mypickaxe View Post

You're maxing out 2 lanes worth of PCIe 3.0. So yes, linking at 5 Gbps is the reason the sequential performance is where it's at. There can be quite a few reasons for this. What do you have installed in the system, if anything beyond your Nvidia GPU and the SSD? Not knowing the Asus 990FX motherboard, it's hard to say without diving into it with knowledge of what you have installed.

I don't have PCIe 3.0 unfortunately..

I am also not running the Sabertooth but an Gigabyte 990 FX Gaming G1 motherboard. I connected it to the M.2 slot.

Strange thing is, is that in BIOS i don't get Nvme options so i cannot configure it but it does see it in windows and the installation went flawlessly. I installed the Samsung driver and everything in Windows is detecting the drive, but the boot times are rather slow compared to my Samsung 850 Pro..

On the other hand, the IOPS seems rather low too compare to the read and write speeds i am getting. I was looking on the Internet about this and i saw that one guy with the same CPU and chipset was getting much higher IOPS, like 65% higher so i guess i am trottling down on something.

I already disabled all the power saving features in BIOS and Windows.

Being on PCIe 2.0 explains why you're only getting a 5Gbps link speed on an x4 connection, seeing as the speed roughly doubles each PCIe generation (a PCIe 3.0 4x connection = a PCIe 2.0 8x connection = a PCIe 1.0 x16 connection). Unfortunately, I think that might be the culprit for your throttled performance. Nothing short of upgrading to a PCIe 3.0 motherboard will unfortunately be able to help relieve that bottleneck...

Something else that's quite important when testing with CrystalDiskMark is to go into settings > Queues and Threads > Set the Threads for "Random" to 4.
Edited by Leyaena - 1/28/16 at 12:13am
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post #566 of 1906
Okay, but even then, the IOSP are rather low would you agree?

And on the motherboard and on the box it clearly says its 20 gbps while i am only getting 5 gbps.. its also very strange that i cannot configure the Nvme in the BIOS.
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post #567 of 1906
Quote:
Originally Posted by hurricane28 View Post

Okay, but even then, the IOSP are rather low would you agree?

And on the motherboard and on the box it clearly says its 20 gbps while i am only getting 5 gbps.. its also very strange that i cannot configure the Nvme in the BIOS.

As I was editing in in my previous post:

Something else that's quite important when testing with CrystalDiskMark is to go into settings > Queues and Threads > Set the Threads for "Random" to 4.
The reason for this is that this SSD is easily maxing out a single thread for random reads, thus creating a bottleneck unless the benchmark uses more than one thread.

For that matter, the built in Samsung benchmark and AS SSD only use a single thread as well.
Edited by Leyaena - 1/28/16 at 12:15am
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post #568 of 1906
Yes i know about this and i did set it to 4 indeed but nothing changed really.. I contacted Samsung about this and they said that the Samsung magician is not reading the 950 Pro properly and there is a new software on its way.. I found that rather strange because i saw people in this thread that were getting proper readings with that software and the speeds are up to spec..
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post #569 of 1906
I'm certain your issues are 100% related to that PCIe 2.0 bottleneck.
The 850 pro NVMe is designed to run at x4 width on PCIe 3.0, for a total of a 10Gbps link speed.

Considering you're on PCIe 2.0, which has a speed of half the PCIe 3.0 speeds, that x4 connection is only giving you a 5Gbps link speed.
My money's on that being the culprit for your decreased performance.

Honestly, it's quite similar to hooking up a SATA III SSD to a SATA II connection.
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post #570 of 1906
1400~1500MB/s is the max you will ever see in an AMD board.
The reason is the PCI-E v2.0 bottleneck.

For a more responsive system you can always shut off the powersaving features of your Bios, so that the constant maximum cpu frequency gives you that small extra boost.
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