X870E GODLIKE M.2 Lane sharing ?

M

MclarenF1Fan108

Member
Joined
Feb 14, 2021
Messages
94
I'd like to be able to run the M.2 PCI-E Gen5 at full speed. But I've heard USB4 shares lanes with M.2_4 ? Also I've heard something about the M.2_2 or M.2_3 one of them lane share too. If I want to run 2 Samsung 9100 Pro with full speed is it possible ?
 
Sort by date Sort by votes
Nichrome said:
That depends on the CPU you install.
Page 17 onwards
Click to expand...
It doesn't say in the manual if M.2_4 slot runs at X4 if the PCI-E_3 is left empty ? Because the PCI-E_3 is a 4X slot up until putting a drive into 2_4 and then the bandwidth is halved.

All the other M.2 PCI-E Gen5 and Gen4 slots appear to run at full speed bandwith if I buy a Ryzen 7000 9800X3D or a Ryzen 9000 9950X3D.

I saw this video with Ronin Wilde. About all the PCI connections. He mentions about the USB4 sharing bandwidth with one of the slots. I don't
See this mentioned on the MSI manual anywhere.

 
Last edited:
Upvote 0 Downvote
MclarenF1Fan108 said:
It doesn't say in the manual if M.2_4 slot runs at X4 if the PCI-E_3 is left empty ? Because the PCI-E_3 is a 4X slot up until putting a drive into 2_4 and then the bandwidth is halved.

All the other M.2 PCI-E Gen5 and Gen4 slots appear to run at full speed bandwith if I buy a Ryzen 7000 9800X3D or a Ryzen 9000 9950X3D.

I saw this video with Ronin Wilde. About all the PCI connections. He mentions about the USB4 sharing bandwidth with one of the slots. I don't
See this mentioned on the MSI manual anywhere.

Click to expand...
I am not 100% positive about lane sharing. I don't have the board to test myself, so can only rely on the manual.
 
Upvote 0 Downvote
MclarenF1Fan108 said:
It doesn't say in the manual if M.2_4 slot runs at X4 if the PCI-E_3 is left empty ? Because the PCI-E_3 is a 4X slot up until putting a drive into 2_4 and then the bandwidth is halved.

All the other M.2 PCI-E Gen5 and Gen4 slots appear to run at full speed bandwith if I buy a Ryzen 7000 9800X3D or a Ryzen 9000 9950X3D.
Click to expand...

I gave you the answer when you asked for the first time:
https://forum-en.msi.com/index.php?...tion-x870e-godlike.412244/page-2#post-2334922
Again: from the first 5 M.2 slots only the first two (from CPU) are 5.0
They don't share bandwidth with anything else, so ... use them!
Also "Ryzen 7000 9800X3D" and "Ryzen 9000 9950X3D" do not exist!
Ryzen 9800X3D and 9950X3D are both Ryzen 9XXX.
 
Upvote 0 Downvote
RemusM said:
I gave you the answer when you asked for the first time:
https://forum-en.msi.com/index.php?...tion-x870e-godlike.412244/page-2#post-2334922
Again: from the first 5 M.2 slots only the first two (from CPU) are 5.0
They don't share bandwidth with anything else, so ... use them!
Also "Ryzen 7000 9800X3D" and "Ryzen 9000 9950X3D" do not exist!
Ryzen 9800X3D and 9950X3D are both Ryzen 9XXX.
Click to expand...
Please understand I have Autism and a learning disability RemusM. So I'm sorry if you have already explained it elsewhere I must have forgotten 😔

The 7000 9000 was a simple dyslexic mistake. It's because the 9800X3D is listed as a Ryzen 7. And the 9950X3D is a Ryzen 9. I realise they are both 9000 series. Ok.

But according to Ronin Wilde on YouTube the M.2 2_2 is sharing USB4... So to get the the full speed I would have to disable the USB4 40GBPS in the BIOS

And the PCI_E3 shares the 4X by splitting the bandwidth between it and 2X speed with the M.2 2_4 regardless whether there is any device inside the PCI_E3 or the M.2 2_4?
 
Last edited:
Upvote 0 Downvote
MclarenF1Fan108 said:
But according to Ronin Wilde on YouTube the M.2_2 is sharing USB4... So to get the the full speed I would have to disable the USB4 40GBPS in the BIOS

And the PCI_E3 is share 2X speed with the M.2_4 ?
Click to expand...

I gave you the link to study it.
Did you do it ?
Again: https://www.msi.com/Motherboard/MEG-X870E-GODLIKE/Specification
7x M.2
M.2_1 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_2 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_3 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 22110/2280 devices
M.2_4 Source (From Chipset) supports up to PCIe 4.0 x2 , supports 2280/2260 devices
M.2_5 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
4x SATA 6G
M.2_1 Source (via M.2 XPANDER-Z SLIDER GEN5) supports up to PCIe 5.0 x4 , supports 2280 devices
M.2_2 Source (via M.2 XPANDER-Z SLIDER GEN5) supports up to PCIe 5.0 x4 , supports 2280 devices

M.2_1:
• Supports up to PCIe 5.0 x4 (For Ryzen™ 9000/ 7000 Series processors)
• Supports up to PCIe 4.0 x4 (For Ryzen™ 8000 Series processors)
M.2_2:
• Supports up to PCIe 5.0 x4 (For Ryzen™ 9000/ 7000 Series processors)
• Supports up to PCIe 4.0 x4 (For Ryzen™ 8700/ 8600/ 8400 Series processors)
• The M2_2 slot will be unavailable when using Ryzen™ 8500/ 8300 Series processors.
M2_4:
PCI_E3 slot will run at x2 speed when installing device in the M2_4 slot. You can switch PCI_E3 slot to x4 in the BIOS, but this will disable the M2_4 slot.

4x USB 2.0 (Front)
4x USB 5Gbps Type A (Front)
8x USB 10Gbps Type A (Rear)
5x USB 10Gbps Type C (Rear)
1x USB 10Gbps Type C (Front)
1x USB 20Gbps Type C (Front)
2x USB 40Gbps Type C (Rear)

* USB 40Gbps Type-C ports on the back panel and M2_2 slot share PCIe 5.0 x4 bandwidth. Both run at PCIe 5.0 x2 when a device is installed in the M2_2 slot. You can switch M2_2 to PCIe 5.0 x4 in the BIOS, but this will disable the USB 40Gbps Type-C ports. The USB4 host controller supports up to PCIe 4.0 x4.
** USB 40Gbps Type-C ports on the back panel only run PCIe 4.0 x2 when install Ryzen™ 8500/ 8300 Series processors.
 
Upvote 0 Downvote
RemusM said:
I gave you the link to study it.
Did you do it ?
Again: https://www.msi.com/Motherboard/MEG-X870E-GODLIKE/Specification
7x M.2
M.2_1 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_2 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_3 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 22110/2280 devices
M.2_4 Source (From Chipset) supports up to PCIe 4.0 x2 , supports 2280/2260 devices
M.2_5 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
4x SATA 6G
M.2_1 Source (via M.2 XPANDER-Z SLIDER GEN5) supports up to PCIe 5.0 x4 , supports 2280 devices
M.2_2 Source (via M.2 XPANDER-Z SLIDER GEN5) supports up to PCIe 5.0 x4 , supports 2280 devices

M.2_1:
• Supports up to PCIe 5.0 x4 (For Ryzen™ 9000/ 7000 Series processors)
• Supports up to PCIe 4.0 x4 (For Ryzen™ 8000 Series processors)
M.2_2:
• Supports up to PCIe 5.0 x4 (For Ryzen™ 9000/ 7000 Series processors)
• Supports up to PCIe 4.0 x4 (For Ryzen™ 8700/ 8600/ 8400 Series processors)
• The M2_2 slot will be unavailable when using Ryzen™ 8500/ 8300 Series processors.
M2_4:
PCI_E3 slot will run at x2 speed when installing device in the M2_4 slot. You can switch PCI_E3 slot to x4 in the BIOS, but this will disable the M2_4 slot.

4x USB 2.0 (Front)
4x USB 5Gbps Type A (Front)
8x USB 10Gbps Type A (Rear)
5x USB 10Gbps Type C (Rear)
1x USB 10Gbps Type C (Front)
1x USB 20Gbps Type C (Front)
2x USB 40Gbps Type C (Rear)

* USB 40Gbps Type-C ports on the back panel and M2_2 slot share PCIe 5.0 x4 bandwidth. Both run at PCIe 5.0 x2 when a device is installed in the M2_2 slot. You can switch M2_2 to PCIe 5.0 x4 in the BIOS, but this will disable the USB 40Gbps Type-C ports. The USB4 host controller supports up to PCIe 4.0 x4.
** USB 40Gbps Type-C ports on the back panel only run PCIe 4.0 x2 when install Ryzen™ 8500/ 8300 Series processors.
Click to expand...
Sorry if your either a bit frustrated or angry with me. No I must have missed reading it when you posted it for me RemusM. Extremely sorry about that. Please understand again I have Autism and some learning difficulties. My memory is also not very good. My point still stands. You can't run a Gen5 drive in 2_2 because it shares bandwidth with the USB4 40Gbps so it won't run at PCI-E 5.0 Gen4 speeds. So this means i might as well buy 1 Gen5 drive for 2_1 slot and a Gen4 drive in 2_2 slot. Thanks I appreciate you wasting your time to reiterate and re post information I should have ready before. Look I really do appreciate all the help everyone has been giving me. It seems not many were willing to help but 4 people have. So thankyou.
 
Last edited:
Upvote 0 Downvote
MclarenF1Fan108 said:
Please understand I have Autism and a learning disability RemusM. So I'm sorry if you have already explained it elsewhere I must have forgotten 😔
Click to expand...

Again: you asked for two PCIe 5.0 x4 M.2 drives.
And I gave you the fastest solution here: use M.2_1 and M.2_2
Ignore that USB 40Gbps thing!
When you connect something there (IF you connect something!) M.2_2 is running in 5.0 x2 mode.
Talking about bandwidth: 5.0 x2 = 4.0 x4
In other words, you won't feel any difference in the real world.
Clear enough now? :biggrin:
 
Upvote 0 Downvote
RemusM said:
Again: you asked for two PCIe 5.0 x4 M.2 drives.
And I gave you the fastest solution here: use M.2_1 and M.2_2
Ignore that USB 40Gbps thing!
When you connect something there (IF you connect something!) M.2_2 is running in 5.0 x2 mode.
Talking about bandwidth: 5.0 x2 = 4.0 x4
In other words, you won't feel any difference in the real world.
Clear enough now? :biggrin:
Click to expand...
Thanks RemusM. Yes. I understand. I'll try not to miss vital information people like you help me with. I can't express how much it really does mean. I am extremely thankful honestly.
 
Upvote 0 Downvote
Back
Top