CH8 (WI-FI) issue with NVMe disk and video card on PCIe slots

[snegir8881]

Hello , Guys.
Sorry for my english, it's not my native language.

Question: why does the motherboard not allow connection at the declared speeds of these devices (video card and M2 drive)? What could be the problem - in the BIOS settings in the motherboard, or is it a issue of the motherboard itself ? What to do, why the declared device speeds on the board are not respected? The disk and video card were checked on another PC, the disk gave the declared speed of 3500 Mb / s, the video card worked on PCIe 3.0 x16 8GBit/s

1) in the programs Crystal disk info and Samsung Magician, the Samsung Evo 970 Plus 1tb disk is displayed as PCI-E 1.0x4 and in the CrystalDiskMark program the read / write speed is about 900 MB/s, which is almost 3 times less than the one declared by the manufacturer of the disk.
2) in the SiSoftware Sandra Lite program and in TechPowerUp GPU-Z, the MSI Geforce GTX-1080TI GAMING X 11G graphics card is displayed as
PCIe x16 1.1 @ 16 1.1.
In BIOS settings: in Advanced / Onboard Devices Configuration PCIE16_2 Bandwidth = X8 Mode; PCIEX16_1 Mode = Auto; PCIEX16_2 Mode = Auto;
PCIEX16_3 Mode = Auto; M2_1 Link Mode = Auto; M2_2 Link Mode = Auto; SB Link = Auto.
Also under Boot / CMS (comaptible Support Module) Launch CSM = Disable.
LN2 Mode jumpers on the motherboard are rearranged in 2-3 pin with default settings.
The video card is installed in the PCIE X16 in the first upper slot, the Samsung Evo 970 Plus 1tb drive is installed in the m2_1 slot next to the processor, there are no sata disks and other devices in the system.
Seasonic TX-1000 Titanium power supply (connected to the motherboard with 2 wires 8 + 4 pin);


System Features:
Amd Ryzen 9 3950x
MSI Geforce GTX-1080TI GAMING X 11G (Driver Version 26.21.14.4274 (NVIDIA 442.74) DCH
G.skill F-3600C16D-32GTNC (CL16-19-19-39, 2 * 16GB, DDR4, 3600MHz)
NVME M2 Samsung Evo 970 Plus 1Tb;
Windows 10 64 bit,
Asus ROG Crosshair VIII Hero (WIFI)
EC Version MBEC-X570-0218,
BIOS- updated to 1302 (originally 0901).
Power supply Seasonic TX-1000 Titanium
Kraken X-62.

Thanks everyone for any help.

[Baio73]

RedSector73 wrote:
Top one has to be boot drive, unless array. (recent thread for that - not confirmed this myself but have no reason to doubt. I use the top one)
There the same for speed to my knowledge, unless you have say 2700x and GEN 4 M2 Nvme device, then you would want to use bottom one and then you find out can't be the boot drive... lol. Guessing this would never happen anyway, not like you buy x570 board for older CPU ZEN chip and latest tech nvme.

sata mode is supported, specifically it means if you used sata mode M2 and it takes one of the SATA drives. off memory older boards did not always support this in both slots. Most of us use M2 Nvme drive(s) so this does not matter.

Formula is the same setup. x370 was the same, your x470 is opposite (correct) for pch and cpu control which is why your asking.

Then micro boards throw this in the air and other brands as well.
Recent run with my setup https://www.userbenchmark.com/UserRun/25789765

Hope you find this of help.

Thanks for your answer.
I'm not so good with english, but I think I got the point... with CH8 Formula I should be able to use the M2 slot controlled by the CPU instead of the one controlled by the Chipset (as in my CH7) without perfomance penalties.

Baio