X570 m.2 raid 방법

I'm trying to create raid 0 from three Samsung 980 pro 1TB, but the total disk size turns out to be 2TB, why is it, where does the third disk go? RAID is exactly 0 not 5, I tried it several times, no changes.

did you check the disk size in BIOS raidxpert or under OS (can you post a screen shot of detail info of that raid array in BIOS)? the only difference between those lanes is M2_1 comes from CPU lanes while other 2 are from PCH lanes

did you check the disk size in BIOS raidxpert or under OS (can you post a screen shot of detail info of that raid array in BIOS)? the only difference between those lanes is M2_1 comes from CPU lanes while other 2 are from PCH lanes
View attachment 148803

so what is the problem here? not like you claim there's 3 1TB SSD, one SSD is actually 0.5TB, so the total amount = 0.5 * 3 = 1.5TB?

so what is the problem here? not like you claim there's 3 1TB SSD, one SSD is actually 0.5TB, so the total amount = 0.5 * 3 = 1.5TB?

thanks. here is my mistake.
why when I create a raid of 2 disks of 1 TB the speed does not increase but remains the same as on one disk?

thanks. here is my mistake.
why when I create a raid of 2 disks of 1 TB the speed does not increase but remains the same as on one disk?

sounds about right as there are four PCIE lanes for the M.2 and lets say they have a max speed of 1000MB per lane so total speed you will get is 4000MB if M.2 SSD runs at asay 3500MB and you add the second one to it the max speed you will ever get is 4000MB as you end up with PCIE lane saturation. But you will not even get that as there is part of the PCIE lane reserved for other stuff so your max speed ends up being 3500MB total regardless of how many M.2 SSD you attach to it.

sounds about right as there are four PCIE lanes for the M.2 and lets say they have a max speed of 1000MB per lane so total speed you will get is 4000MB if M.2 SSD runs at asay 3500MB and you add the second one to it the max speed you will ever get is 4000MB as you end up with PCIE lane saturation. But you will not even get that as there is part of the PCIE lane reserved for other stuff so your max speed ends up being 3500MB total regardless of how many M.2 SSD you attach to it.

transfer speed 64gb/s
my two samsung 980 pro drives in raid 0 are running at 5000 MB/s
but one has speed
Genuine PCIe 4.0 NVMe® speed (up to 7,000/5,000MB/s for read/write speed)
why is the speed not 10-14gb/s in raid 0?

sorry i am using google translate

OK this link will take you to a PCIE test of a 16 lane PCIE 4 board with a PCIE gen 4 GPU running at the full PCIE X16 Gen 4
If 16 lanes not going to hit 64GBs, how are M.2 that share the same four PCIE lanes going to hit 64GBs

my two samsung 980 pro drives in raid 0 are running at 5000 MB/s
but one has speed
Genuine PCIe 4.0 NVMe® speed (up to 7,000/5,000MB/s for read/write speed)
why is the speed not 10-14gb/s in raid 0?

What's your motherboard BIOS version? Which M.2 slots are these two 980 pro drives installed in?
If you use M2_2 and M2_3, make sure they are set to Gen4 or Auto. Boot to BIOS > Advanced Mode (F7) > Settings > Advanced > PCI Subsystem Settings > Chipset Gen Switch > Gen4.

Bios version
7C35vA93(Beta version)

I am using M2_2(980 pro 1TB) and M2_3(980 pro 1TB) is set to Gen4

M2_1 980 pro 500gb

couple limitation i could think of
1. iirc, if you use the RAID volume as storage instead of OS drive, the performance would be better (are you using it as OS or storage drive?)
2. perhaps the performance is cap by the PCH -< CPU bandwidth, theoretically it can go up to 8K and im not sure why it only goes to 5k on your system

Can you try test the raid volume as a storage only? and can you plug M.2 on M2_1 & 2 (CPU + PCH) instead of M2_2 & 3 (PCH + PCH)?

It's been tested with followed configuration:
Test Configuration:
MB: X570 UNIFY
CPU: 3900XT
BIOS: E7C35AMS.A93
SSD: Samsung 980 250GB x 2 + 1 SATA SSD as OS drive

1. Build Raid 0 on M.2 adapter with 2 samsung 980 250GB SSD on PCIe1 slot (CPU lanes) – Optimized scenario

2. Without M.2 adapter, the performance will drop depending on the used slot. (CPU + PCH lanes slot > PCH + PCH lanes slot) The same behavior can be seen on other brand motherboard too.

If you don't have have an adapter, to improve your current performance you can try those steps:
1. Improve air flow around M.2 to ensure no throttling when running benchmark.
2. Install M.2 SSD on M2_1 & M2_2 (CPU + PCH lanes slot). ( => the speed can go over 8000MB/s, 5000MB/s for read/write.)
3. Update SSD firmware by Samsung Magician.
4. Do not use RAID volume as primary drive (OS drive), using it as storage drive will improve the performance.

Did you figure this out? I moved 1 of my M.2's to the CPU spot, much quicker now. Using the PCH slots doesn't provide enough lanes (4) to give you the speeds you want.