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Old May 27, 2017, 09:31 PM
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Default Getting the most out of M.2 RAID 0 ?

So I picked up a pair of Samsung 250GB EVO M.2 drives and currently have them setup as a RAID 0 on my ASUS Strix Z270F motherboard. It's quite obvious I've reached the DMI 3.0 interfaces bandwidth limit at around 3.93 GB/s for the CPU–PCH link. My question here is if I were to use a PCIe 4x M.2 adapter card for 1 of my drives (or possibly both) could I setup my RAID 0 in a way to get the M.2 drive's full potential?
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Old May 27, 2017, 10:24 PM
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Correct me if I am wrong but are the evo 250GB drives not sata M.2 drives? If so then I doubt getting a PCIe 4x M.2 adapter card will any difference. Even if the drives are NVMe then I still doubt you would get any better performance using an adapter.
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Old May 27, 2017, 10:31 PM
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They are the Samsung 960 Evo NVMe M.2 drives. I have the option in the Bios to run one in either SATA or PCIe and the other as PCIe only. Currently I have them setup in RST, both PCIe 4x.

https://www.newegg.com/Product/Produ...82E16820147593

Intel® Z270 Chipset :
1 x M.2 Socket 3, with M Key, type 2242/2260/2280/22110 storage devices support (both SATA & PCIE mode)*2
1 x M.2 Socket 3, with M Key, type 2242/2260/2280 storage devices support (x4 PCIE mode)*3
6 x SATA 6Gb/s port(s)
Support Raid 0, 1, 5, 10
Supports Intel® Smart Response Technology*4
Intel® Optane™ Memory Ready *5
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Old May 28, 2017, 09:20 AM
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Quote:
Originally Posted by Ghettochild_2600 View Post
So I picked up a pair of Samsung 250GB EVO M.2 drives and currently have them setup as a RAID 0 on my ASUS Strix Z270F motherboard. It's quite obvious I've reached the DMI 3.0 interfaces bandwidth limit at around 3.93 GB/s for the CPU–PCH link. My question here is if I were to use a PCIe 4x M.2 adapter card for 1 of my drives (or possibly both) could I setup my RAID 0 in a way to get the M.2 drive's full potential?
No - the raid configuration is dependent on the devices being connected to the chipset/pch. It's using Intel RST. If you put an adapter card in the last full-length slot on your motherboard (16x physical, electrically x4 PCI-E 3.0) that slot is traced to the chipset, so you are still communicating via x4 DMI 3.0 back to the CPU. It'll work but it's the same situation as the dual M.2 slots.

The other full length slots are traced directly to the CPU, and those will not support NVME raid with the other device connected via the chipset. You can certainly put an NVME drive there and even boot from it, you just can't raid via the embedded UEFI/BIOS configuration.

Might I ask where you actually encountered full saturation of the DMI 3.0 link? Outside of synthetic benchmarks, it should be an infinitesimal small possibility of saturation, even with raid0.

If it's really an issue, you're only options are X99/X299 (Intel) or Threadripper (AMD).
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Old May 28, 2017, 05:27 PM
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PCI-e depends on cpu 28 or 40 lanes
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Old May 28, 2017, 11:15 PM
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Quote:
Originally Posted by Vittra View Post
Might I ask where you actually encountered full saturation of the DMI 3.0 link? Outside of synthetic benchmarks, it should be an infinitesimal small possibility of saturation, even with raid0.
Well, it's already plenty fast already. At least 3x faster than my ssd raid setup. I guess I was just expecting at least 1.5x more performance in RAID0 with x2 m.2 drives, but wasn't sure of the bandwidth limitations, or if there was a way to bypass it. I'll look to a x99/X299 platform in the future.

Asus STRIX Z270F GAMING Performance Results - UserBenchmark
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