So using M.2 drives makes me lose sata ports in Aorus Master? Help me understand please... - Overclock.net - An Overclocking Community
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So using M.2 drives makes me lose sata ports in Aorus Master? Help me understand please...

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post #1 of 11 (permalink) Old 11-06-2018, 10:02 PM - Thread Starter
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So using M.2 drives makes me lose sata ports in Aorus Master? Help me understand please...

Hello,
So I finally got almost all my parts for my 9900k build but I was about to order a 970 Evo M.2 when I read that using an M.2 drive is going to disable 2 of my Sata ports of which already I only had 6 and was going to use all of them. Is this correct? Is there no way around this like maybe a PCI-e to Sata card?
I am old school with my X58 so not used to these things.

Thanks!

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post #2 of 11 (permalink) Old 11-06-2018, 10:11 PM
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http://www.tomshardware.com/forum/id...rt-issues.html

It seems to vary from board to board. I don't understand why it would ... M2 SATA, sure, but not an NVME. All my SATA ports still work on my Z170-E with my NVME.

Add in SATA card would solve your issues (if you have them) and they can be had cheap on eBay.

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Last edited by The Pook; 11-06-2018 at 10:15 PM.
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post #3 of 11 (permalink) Old 11-06-2018, 10:12 PM
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Quote: Originally Posted by shaolin95 View Post
Hello,
So I finally got almost all my parts for my 9900k build but I was about to order a 970 Evo M.2 when I read that using an M.2 drive is going to disable 2 of my Sata ports of which already I only had 6 and was going to use all of them. Is this correct? Is there no way around this like maybe a PCI-e to Sata card?
I am old school with my X58 so not used to these things.

Thanks!
z370 and z390 are the same in that regards, 24 pcie lanes, 3x m.2 slot, if all 3 m.2 are used then 4 sata ports will not work. i would recommend to run m.2 ssd via cpu lanes instead. not only you get lower latency without having to go through chipset you also dont lose any sata ports. you will lose pcie lanes though and single GPU is more than enough.
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post #4 of 11 (permalink) Old 11-06-2018, 10:15 PM
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Read the manual of the board. It has tables that show what's happening exactly when you put stuff into the different M.2 slots that the board has. Not all configurations will disable SATA ports, you need to look this up to find out what will happen.
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post #5 of 11 (permalink) Old 11-07-2018, 09:41 AM
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Quote: Originally Posted by unityole View Post
z370 and z390 are the same in that regards, 24 pcie lanes, 3x m.2 slot, if all 3 m.2 are used then 4 sata ports will not work. i would recommend to run m.2 ssd via cpu lanes instead. not only you get lower latency without having to go through chipset you also dont lose any sata ports. you will lose pcie lanes though and single GPU is more than enough.

Is the difference noticeable when running m.2 ssd via the cpu lanes vs the chipset? I know the chipset gets bottle necked by DMI as well but I haven't seen much on how badly as it kinda depends on what other devices are using the chipset. The thing is with this board at least if you use the second slot the GPU slot speed gets downgraded to 8x which I've seen reduces FPS in games by like a little less than 10% using a gtx 1080 ti.

As far as OP's question goes, according to the motherboard manual. http://download.gigabyte.us/FileList...ter_1001_e.pdf

Due to the limited number of lanes provided by the Chipset, the availability of the SATA connectors may be affected
by the type of device installed in the M2. sockets. The M2M connector shares bandwidth with the SATA3 4, 5
connectors. The M2A connector shares bandwidth with the SATA3 1; the M2P connector shares bandwidth with
the PCIEX4 connector. Refer to the following tables for details.

If you look at the diagrams, you can actually use all sata ports if you install a m.2 ssd in the middle m.2 connector (m2a) it will just share bandwidth on the first sata port or if the ssd is small enough to fit in the bottom m.2 (m2p) it will share bandwidth with the bottom pcie port. If your m.2 ssd won't fit in the bottom slot you could just get a m.2 pcie adapter and put it in the bottom pcie slot that way you don't share bandwidth with the sata drives (although they do ultimately get shared over the DMI).

Last edited by Keninishna; 11-07-2018 at 09:45 AM.
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post #6 of 11 (permalink) Old 11-07-2018, 07:29 PM
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Quote: Originally Posted by Keninishna View Post
Is the difference noticeable when running m.2 ssd via the cpu lanes vs the chipset? I know the chipset gets bottle necked by DMI as well but I haven't seen much on how badly as it kinda depends on what other devices are using the chipset. The thing is with this board at least if you use the second slot the GPU slot speed gets downgraded to 8x which I've seen reduces FPS in games by like a little less than 10% using a gtx 1080 ti.

As far as OP's question goes, according to the motherboard manual. http://download.gigabyte.us/FileList...ter_1001_e.pdf

Due to the limited number of lanes provided by the Chipset, the availability of the SATA connectors may be affected
by the type of device installed in the M2. sockets. The M2M connector shares bandwidth with the SATA3 4, 5
connectors. The M2A connector shares bandwidth with the SATA3 1; the M2P connector shares bandwidth with
the PCIEX4 connector. Refer to the following tables for details.

If you look at the diagrams, you can actually use all sata ports if you install a m.2 ssd in the middle m.2 connector (m2a) it will just share bandwidth on the first sata port or if the ssd is small enough to fit in the bottom m.2 (m2p) it will share bandwidth with the bottom pcie port. If your m.2 ssd won't fit in the bottom slot you could just get a m.2 pcie adapter and put it in the bottom pcie slot that way you don't share bandwidth with the sata drives (although they do ultimately get shared over the DMI).
dmi 3.0 is like 3.9 GB/s at cap, there are no pcie 3.0 x4 SSDs that can exceed it yet unless you run at high QDepth so in terms of bottleneck, there isnt.

however running m.2 SSD via chipset mean going through chipset/dmi thus increases latency, where as running through CPU lanes doesn't have that extra latency. difference is probably not noticeable unless you do benchmark, though I do feel a bit snappier since im a storage enthusiast. Pcper has great article about it but thats the answer anyway.

but basically yes, he needs to look at his mobo's manual/schematic w/e it is called and see which port he could use. if he plan to use full 6 sata slots.. im afraid theres not a lot of option.
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post #7 of 11 (permalink) Old 11-13-2018, 02:23 AM
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Does that Problem affect all Z370/Z390 Boards or only Aorus Master?

I will buy a Aorus Pro Wifi but I Need all Sata Ports! In my Z370 Pro4 Asrock I had a M.2 Drive and was able to use all SATA Ports, so I wonder if its a general chip problem!
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post #8 of 11 (permalink) Old 11-15-2018, 07:58 AM - Thread Starter
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To update I used the bottom slot for the m.2 drive and all my Sata ports are available.
Thanks all

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post #9 of 11 (permalink) Old 11-15-2018, 12:47 PM
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Use your m.2 on the very bottom port on the Master. Then you still have all of your Sata and also can still 2way SLI.
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post #10 of 11 (permalink) Old 11-15-2018, 12:50 PM - Thread Starter
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Quote: Originally Posted by Moparman View Post
Use your m.2 on the very bottom port on the Master. Then you still have all of your Sata and also can still 2way SLI.
LOL that is literally what I just said before your post

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