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WD SN850 Slower than expected performance

las

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Don't compare to reviewers using it as 2nd non-OS drive especially not if its emphy, numbers will always be better, it looks fine to me, i have 970 Evo, 970 Evo Plus, SN750 and SN850 + 980 Pro and the SN850 is the fastest of them all altho 980 Pro is close and wins some tests but overall SN850 is faster and often cheaper too
 

dominicc

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In my opinion, WD SN850 is okay in platform compatibility.
Except that with BIOSs < 1.44 of the ASRock X570 Taichi Razer Edition the system doesn't POST with 1 or more SN850 installed in any slot - reported to ASRock here: https://forum.asrock.com/forum_posts.asp?TID=18733&PID=86769&#86769

Confirmed that the Beta BIOS 1.44 'fixed' it, but the ASRock tech support said they didn't change anything related to NVME between 1.40 (non-working) and 1.44 (working)...

ASRock support quote: "BIOS L1.44 mainly update the AMD AGESA Code to 1.2.0.2, we didn’t adjust any M.2 functions"

The drive still isn't listed on their Storage QVL for *any* of their X570 motherboards.

Firmware on my SN850's was 611100WD at the time of installation.
 
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I recently bought the WD SN850, My motherboard which is the MSI B450 Tomahawk max, which only has one M.2 Slot and this is the results I'm getting well below what i expected, is it the motherboard or something else?
1620905052236.png
 
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I recently bought the WD SN850, My motherboard which is the MSI B450 Tomahawk max, which only has one M.2 Slot and this is the results I'm getting well below what i expected, is it the motherboard or something else?
View attachment 200204
You only have PCIe 3.0 on that board, not PCIe 4.0, so those numbers are quite good for PCIe 3.0.
 
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Processor ryzen 5 2600
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You only have PCIe 3.0 on that board, not PCIe 4.0, so those numbers are quite good for PCIe
Thought it might've been the board, just had to double check thank you boss, cant complain too much still better than regular SSD
 
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I recently bought the WD SN850, My motherboard which is the MSI B450 Tomahawk max, which only has one M.2 Slot and this is the results I'm getting well below what i expected, is it the motherboard or something else?
View attachment 200204

Hmmm, wonder what the issue is?

Just grabbed a new SN850 500GB myself and here's the CrystalDiskMark 1st run today.

My board has (3) M.2 slots, only one is PCIe 4.0. I know in some bios you sometimes need to activate (enable) various M.2 slots.

Hope you find out what's going on... Good Luck Mate! :toast:

WD Black SN850 500GB.jpg

IMG_E2518.JPG
 
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tallarnk

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Hello! You'll have to forgive me I'm just an average user, but I've been interested in the on going discussion regarding these drives. I recently purchased an Aorus X570 master rev 1.2 MB specifically for the option of having 3 m.2 slots on the board. Great! I thought. However after noticing stuttering issues with a capture card I have and narrowing the issue down to the onboard WIFI adaptor causing the problem I thought there is perhaps the same thing causing an issue with the drive speed as i've got pretty similar results. the Issue causing the capture card to have reduced bandwidth is that the WIFI adaptor seems to be limiting the max payload on everytthing that uses the same bus ? (sorry this might be incorrect way of putting it) to 128 bytes. I've emailed Gigabyte to see what can be done because there isn't an option in the BIOS to disabled the adaptor and I can't remove it without taking off the plastic shroud thingy. So although I've read what the MB vendor in the other person(s) instance(s) and WD had to say I wonder is this is the case with my board at least, but also it might be something to check on your own board. I used a program called HWiNFO64. I'm sure all you tech experts have heard of it. Do you think this is a possible cause of the drive speed limitation ?
 

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Hello! You'll have to forgive me I'm just an average user, but I've been interested in the on going discussion regarding these drives. I recently purchased an Aorus X570 master rev 1.2 MB specifically for the option of having 3 m.2 slots on the board. Great! I thought. However after noticing stuttering issues with a capture card I have and narrowing the issue down to the onboard WIFI adaptor causing the problem I thought there is perhaps the same thing causing an issue with the drive speed as i've got pretty similar results. the Issue causing the capture card to have reduced bandwidth is that the WIFI adaptor seems to be limiting the max payload on everytthing that uses the same bus ? (sorry this might be incorrect way of putting it) to 128 bytes. I've emailed Gigabyte to see what can be done because there isn't an option in the BIOS to disabled the adaptor and I can't remove it without taking off the plastic shroud thingy. So although I've read what the MB vendor in the other person(s) instance(s) and WD had to say I wonder is this is the case with my board at least, but also it might be something to check on your own board. I used a program called HWiNFO64. I'm sure all you tech experts have heard of it. Do you think this is a possible cause of the drive speed limitation ?

Just pulled out my intel wifi card, still getting crappy writes:
1623534478086.png


I do still see limitation to 128bit though on the chipset lanes dur to titan ridge thunderbolt controller:
1623535114680.png


Disabling Thunderbolt controller and I now get 256bit bus and SN85O writes have increased by 2gb/s to 5129 MB/s , so it seems SN850 needs that 256 bus or more to get max write speeds.

Well done @tallarnk for finding the root cause :)

1623536165860.png
 
Last edited:

tallarnk

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oh that's brilliant, I'm so glad! I'm also bloody annoyed, how is the average user supposed to know that on purchase..oh btw some of your stuff won't work correctly. the only things that are mentioned clearly in the manual are the 2 end sata ports.
 
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