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Samsung SM961 NVMe Thread - Page 37

post #361 of 441
Originally Posted by lio256 View Post

That could be due to that you are using a PCIe expansion card to connect the NVMe drive. Maybe would be a better driver to compare in that case.. they need to be installed by using the Let me pick from a list, Have Disk option for anyone having trouble installing.

SamsungNVMedriver1.4.7.16-Driver.zip 74k .zip file

One issue with using the Samsung setup .exe to install drivers is that they do not perform a clean uninstall, and leave a mess in the registry after uninstalling. Probably not an issue as far as performance goes, but it's pretty sloppy on Samsung's part. I'd recommend to uninstall via device manager and select the delete driver option, but don't restart when prompted. Instead boot into safe mode and Windows will revert to the Microsoft driver, (Hold SHIFT while clicking restart) and update the driver from there.

As a comparison here are the results

That looks much better and great tips. Especially the one to boot into safe mode. I knew the method to go to the safe-mode, but to do it at that moment is great. I have had a situation that I have to flash my bios with version specool.gif

What did you do with the Delivery Optimization? On or Off.
I have tested (Samsung driver from Dell) Sec - 2560 on a SM961 256Gb, but it has a unsafe shutdown.
Later this day I will post a comparison between all the drivers. Clean Install - Before and after loading chipset drivers. Unsafe shutdown/Error in system log.
I will try the
post #362 of 441
Originally Posted by lio256 View Post

I have done some testing on the different drivers. I have only looked at the Read speeds, because the write speeds seems concistent.
This is done with a SM961-256Gb - Specs Read 3100/Write 1400. There is no overall winner, but the Samsung from Dell and the Intel are the best consistent drivers. Because the system log reports an error on the Intel driver I prefer the Samsung from Dell. The Samsung 2.4.70. driver is also good, but this driver drops to much after 75 seconds. When Samsung driver had a higher 4k read than I would prefer that driver.

I hope you can make a choice now.

Edited by Pano - 1/11/17 at 12:27pm
post #363 of 441
I have this annoying thing going on, please bear in mind my tech knowledge is marginal. On my X99a mobo if I use the EZ overclocking facility, my 961 promptly cuts its sequential reads to about half. If I set the bios back to defaults the 961 speeds up to nornal values. The Bios reports that I have overall gains of 20% and he whole PC feels faster, except the 961. The bios gives no details of what is teaked. I could not do this manually.

I am hoping that someone will point out a setting or two somewhere that I could check - after doing the EZ tweak - thereby leaving most of the overclock in place

post #364 of 441
post #365 of 441
What can cause so small numbers in 4K tests?

The system is ASUS MAXIMUS V FORMULA(Z77) with i7-3770K CPU and SM961 1TB SSD. I tried both Microsoft and Samsung drivers, also tried to disable HPET, no visible changes.
post #366 of 441
Thread Starter 
Originally Posted by mrgod View Post

What can cause so small numbers in 4K tests?

The system is ASUS MAXIMUS V FORMULA(Z77) with i7-3770K CPU and SM961 1TB SSD. I tried both Microsoft and Samsung drivers, also tried to disable HPET, no visible changes.

Turn off c-states in bios and all powersave in windows.
Overclock cpu to 4500mhz+
Overclock memory to 2666mhz+
post #367 of 441

C-states and SpeedStep are off.
post #368 of 441
I think this will be of interest to this thread - potentially it explains the anomolies some epxeierence\;

\the full article is linked below\;

Slow M.2.... speeds...

"he problem turned out to be something as simple as our overclock settings. We use Corsair Vengeance LPX DDR4 modules rated at 2,800MHz, and we were using their built in XMP profile for our system's overclock. However, this automatically sets the base clock to 125MHz, which is a requirement when using high frequency memory (i.e. above 2,666MHz) on X99. However, this also affects the speed of other parts of the CPU, not just the cores, and one of those parts is the onboard PCI-E Gen 3.0 controller. In turn, in order to maintain PCI-E stability at this clock, our motherboard was downgrading the PCI-E interfaces to Gen 2.0. You can force the graphics slots back to Gen 3.0, but there's no such option for the M.2 slot, which makes sense since storage devices require perfect stability. We have not been able to confirm exactly how other motherboard manufacturers handle the situation, but it's probably safest to stick to 2,666MHz DDR4 on X99 when using a PCI-E 3.0 storage device. It should also not be a problem on Z170, where the PCI-E controller's clock is separate to the CPU BCLK. "


I wish I undrstood it, |I don't . I want to overclock, but everytime I use Asus EZ clock, my M.2 slows down dramatically. If I knew what the EZ overclock specifically did, I might be able to isolate the bit thgat causes the slow down
post #369 of 441

Apparently, the solution for some will be to buy this card. Because the M.2 drive is in the card, you will now be able with an Asus X99 mobo, to adjust the slot to Gen 3 after ovrclock
post #370 of 441
Bought the card - no difference in speed
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