Question Maximus X Hero z370 and pcie lines problem

[Ksin22]

Recently installed two m.2 drivers Nvme x4 after that motherboard not see my pcie network card. Cpu (i7 8700K) got 16x lines witch fills GPU but how many lines got PCH? Both M.2 drivers run at x4 speed is it lack of lines or I'm missing some setting in BIOS?

 

[vMax]

Below is a good thread on PCIe lanes and lane sharing on the Z370 platform. I believe you cannot run 2 NVMe at x4 as this will steal lanes for other devices like your network card....You should be able to run one at x4 and one at x 2 but this should help.

https://www.overclock.net/forum/6-i...2-pcie-question-about-pcie-lanes-sharing.html

Hopefully others better than me can jump in...

 

[Ksin22]

I heve read that before, motherboard itself disables two SATA posrt (5,6) when connect both m.2 ports. All the other onboard devices shares PCH lines (USB, Audio, Raid, SATA, etc.). Is it matters that m.2 drivers run on RAID0 and add an extra Raid support? Can I disable some extra USB hub don't need all of them will that add an extra line or bandwich?

 

[vMax]

I heve read that before, motherboard itself disables two SATA posrt (5,6) when connect both m.2 ports. All the other onboard devices shares PCH lines (USB, Audio, Raid, SATA, etc.). Is it matters that m.2 drivers run on RAID0 and add an extra Raid support? Can I disable some extra USB hub don't need all of them will that add an extra line or bandwich?

To be honest I am a little out of my depth even though I use a Z370 motherboard but only with on NVMe drive. I know we lose a couple of SATA ports but this is a slightly different issue. I did find this thread:

'On the intel side, for example z370:

x16 pci 3.0 lanes for the gpu

4x 3.0 lanes to the chipset (its not pci, but its the same speed as 4x 3.0). There are 24(iirc) 3.0 pci lanes off of the chipset. But they must all share the x4 link. All the usb ports, sata ports, everything else must share the 4x lanes.

All m.2 drives will be connected to the chipset and share the 4x chipset lanes.

You can have 1 m.2 drive running at near full speed(still has to share with sata ports usb ports, etc). Or if you have more then 1 m.2 slot they will have to share. If you have 2 top end m.2 drives they would be running at about half their maxium read speed. 3 top end m.2s would be down to 1/3rd their max speed. You could access any 1 drive at near full speed, but if you tried to do more then 1 at the same time they would all suffer.'

There are some great people on here who should know the exact breakdown on the PCIe lane sharing side and fingers crossed they will jump in.

 

[Ksin22]

Thanks for replay. So RAID0 is not great idea as one of the slots will be down on half the speed and so whole RAID config. Only thing when test RAID setup with ATTO it shows stock speeds form my drivers and write speed was even slightly higher. My drivers are two ADATA SX8200PRO 512GB stock speeds 3350/2350.

 

[vMax]

Thanks for replay. So RAID0 is not great idea as one of the slots will be down on half the speed and so whole RAID config. Only thing when test RAID setup with ATTO it shows stock speeds form my drivers and write speed was even slightly higher. My drivers are two ADATA SX8200PRO 512GB stock speeds 3350/2350.

I have the same ADATA drive and it is great...I think you would get slightly higher but not what you should normally get from a RAID setup...I keep hoping someone will jump in with a proper answer.....

 

[Ksin22]

I think I've sort it out. Dismental RAID and get rid of Intel Raid Controler and then found that second PCI16 socket for graphic card was set PCIEx4 strange as it's not used, but I could only set it up on x2. Then my PCIE network card appear in BIOS.