Samsung 970 evo plus raid 0 speed?

[Shooter]

Hi guys i created a raid 0 of 2 1tb 970 evo plus drives. I can see the volume, however I only get the performance of a single drive any idea why?

 

[nagapie]

Hi guys i created a raid 0 of 2 1tb 970 evo plus drives. I can see the volume, however I only get the performance of a single drive any idea why?

Whats your pc specs? Some Motherboards don't support x4 on both M2 slots.

 

[AceSwiftShooter]

Isn't there also a bandwidth throuput limit on the lanes? Not sure what the limit is.

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[Shooter]

Whats your pc specs? Some Motherboards don't support x4 on both M2 slots.

I have checked both are running at x4

pc specs:

• Asus Z370 Formula
• 8700k
• 32 gb 3600
• 2 x 1080TI

 

[AceSwiftShooter]

You say performance of a single disc.
Is this is crystal disk? Or have you copied something the the raid and seen speeds?
Could be that crystal disk does not read correctly.
Try different software.

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[Shooter]

You say performance of a single disc.
Is this is crystal disk? Or have you copied something the the raid and seen speeds?
Could be that crystal disk does not read correctly.
Try different software.

Sent from my ONEPLUS A6013 using Tapatalk

Hi yes it is, i had a look at other user online who has also raided the 970 evo plus they get double my speed.
it might be crystal disk, will try something else tonight thanks.

 

[nagapie]

Hi yes it is, i had a look at other user online who has also raided the 970 evo plus they get double my speed.
it might be crystal disk, will try something else tonight thanks.

Firstly are the other peeps using sli and raiding?

You running sli so then you won't be able to raid two nvme drives at x4 because you don't have enough pci lanes to run at full bandwidth. I could be wrong but it's the first thing that comes to mind. Try using one 1080ti and take the other one out.

 

[iamgigglz]

AFAIK the PCIe 16x slots on the board are using the CPU PCIe lanes, and the M.2 slots are using the PCIe lanes from the mobo chipset, so your GPUs won't affect your M.2 performance.

The catch is that the Z370 chipset is linked to the CPU with a DMI 3.0 bus, which can only run at speeds equivalent to PCIe 3.0 4x, or 3.94 GB/s...minus a little compression and raid controller overhead and you get your ~3.5 GB/s

 

[Shooter]

AFAIK the PCIe 16x slots on the board are using the CPU PCIe lanes, and the M.2 slots are using the PCIe lanes from the mobo chipset, so your GPUs won't affect your M.2 performance.

The catch is that the Z370 chipset is linked to the CPU with a DMI 3.0 bus, which can only run at speeds equivalent to PCIe 3.0 4x, or 3.94 GB/s...minus a little compression and raid controller overhead and you get your ~3.5 GB/s

Thanks that explains alot.

Do you know if a pci raid card in the bottom pci would run at full speed?

 

[iamgigglz]

Do you know if a pci raid card in the bottom pci would run at full speed?

Only your top two x16 slots are connected directly to the CPU, the others are using the PCH, so plugging a raid card into any slot other than the top two will face the same DMI 3.0 bottleneck.

The only way you're going to get faster performance would be to move one GPU to the bottom slot and put the Raid card in one of the top two slots. It would then share your 8700k's 16 pcie lanes with one gpu and run at PCIe 3.0 8x, effectively doubling the available bandwidth. Not sure if it would have any impact on GPU performance.

 

[Shooter]

Only your top two x16 slots are connected directly to the CPU, the others are using the PCH, so plugging a raid card into any slot other than the top two will face the same DMI 3.0 bottleneck.

The only way you're going to get faster performance would be to move one GPU to the bottom slot and put the Raid card in one of the top two slots. It would then share your 8700k's 16 pcie lanes with one gpu and run at PCIe 3.0 8x, effectively doubling the available bandwidth. Not sure if it would have any impact on GPU performance.

Now i get it, thanks for all the help appreciate it.

 

[JollyJamma]

What are you using the drives for?

I really doubt you’ll notice a real world application improvement with a RAID zero config - the 970 is fast enough as is and unless you’re rendering 4K footage with the need to scrub video on the fly, it’ll be largely pointless.

I’m not saying it won’t be amazingly fast, I’m just not sure it’ll benefit you as much as the raw I/o figures suggest.

 

[Shooter]

What are you using the drives for?

I really doubt you’ll notice a real world application improvement with a RAID zero config - the 970 is fast enough as is and unless you’re rendering 4K footage with the need to scrub video on the fly, it’ll be largely pointless.

I’m not saying it won’t be amazingly fast, I’m just not sure it’ll benefit you as much as the raw I/o figures suggest.

I use it in my editing/gaming pc, also doubt that there would be a noticeable difference,would have been nice though.

 

[JollyJamma]

I use it in my editing/gaming pc, also doubt that there would be a noticeable difference,would have been nice though.

Why do you use something like Primocache to make the one drive a caching drive? Linus tested it and said it was a better solution than Intels Optane.

Or put the more relevant data on the one drive so that you get a combo of the read from one drive and the write from another?

Just some thoughts.