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ASUS ROG MAXIMUS Z790 HERO AND PCIe lines

francoistoen
Level 9

HI
I need some help about PCIE lines and PCIE bifurcation.
First my configuration: (see picture)MZ790HERO.jpg
Motherboard : Asus ROG MAXIMUS Z790 HERO
CPU Intel core i9-14900KF
GPU/Graphics : XFX RADEON RX5700 XT (PCIe 4x16) in extension slot PCIEX16(G5)_1
Memory : 2x16 Gbytes DDR5 Corsair
Storage
1 x SAMSUNG NVME M2 SSD 990PRO (PCIe 4x4) 1To in slot M2_1 (system)
2 x SAMSUNG NVME M2 SSD 970 EVO PLUS (PCIe 3x4) 500Go in slots M2_2 and M2_3
2 x SAMSUNG NVME M2 SSD 970 EVO PLUS (PCIe 3x4) 500GO 2 in Hyper card plugged in extension slot PCIEX16(G5)_2 in raid0 mode
1 x SAMSUNG NVME M2 SSD 970 EVO PLUS (PCIe 3x4) 2To in PCIE to NVME M2 adapter card in expansion slot PCIE16(G4)
2 x SAMSUNG SATA3 SSD 860 EVO 500Go
2 x SATA3 Hard drive 1 GO.

All this is perfectly detected, working but :
GPU-Z detect my graphic card as a PCIe4x8
Samsung magician detecte ALL the nvme SSD as PCIe Gen 2x1.

I need 16+4=20 PCIe4 lines (16 GPU and 4 for NVME M2 990 PRO)
I need 20 PCIe3 lines ( 5 x NVME M2 SAMSUNG 970 EVO PLUS)
and I don't know how to figure out the way to do it.
I know tha 6 NVME SSD M2 is too big for a motherboard designed for only 5.
I'm wondering if it is possible to have:
GPU 4x16
one NVME SSD 4x4
and 3 or 4 NVME 3x4
Hereafter I need 16 PCIe4 lines and 12 or 16 PCIe3 lines.
Some ideas about that configuration?
Thanks in advance

François

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2 ACCEPTED SOLUTIONS

Accepted Solutions

francoistoen
Level 9

Hi

Thank you for your answer.

In fact I can use M2_1 and get GPU running at 16 on PCIEXT(G5)_1. To do that you only need NOT to connect anything on PCIEXT(G5)_2. It is what i have done and it is OK. see picture.

Sans titre.jpg

For the SSD speed i found a solution. I disabled the Intel VMD in UEFI (make some trouble thenafter to boot but the good way is to boot in safe mode). 

Now everything is OK : GPU at 16, all nvme at 4 (2xNVME SSD installed into Hyper M2 board and the board in PCIEX(G4).

Yours faithfully

 

View solution in original post

Yes, you are right. The Intel 14900KF CPU can handle 20 PCie lines (version 4 or 5), i.e. x16-x4 or x8-x8-x4.

Yours sincerely

View solution in original post

3 REPLIES 3

JohnAb
Level 17

First off, if you want to use M.2_1 then you are only going to get x8 on the GPU. However, that will only result in a speed reduction of 5% max in practice, maybe only 3%, so not really an issue. 

My next thought is why you are only getting Gen 2 speeds on all of the SSDs. I'd suggest removing the Hyper card as a first step and just see what speeds you get then. I suspect that with that removed, you should get the expected speeds. Just try and see, it will helpful to understand your options better.  

Without the Hyper card, I would expect that all motherboard M.2 drives should be running at full speed. 

Another option might be to consider getting an external TB4 enclosure. I have one, but although the speed test results are good, about 3,000MB/s in tests, in actual use it's not really any faster than an external normal USB 10Gb/s external enclosure. 

I guess your decision will have to based on whether you need speed or capacity. 

 

Z690 Hero, 12900K, BIOS 3603, MEI 2407.6.1.0, ME Firmware 16.1.32.2418, 7000X Case, RM1000x PSU, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 23H2, Corsair H150i Elite AIO, 4x Corsair RGB fans, 3x M.2 NVME drives, 2x SATA SSDs, 2x SATA HDs.

francoistoen
Level 9

Hi

Thank you for your answer.

In fact I can use M2_1 and get GPU running at 16 on PCIEXT(G5)_1. To do that you only need NOT to connect anything on PCIEXT(G5)_2. It is what i have done and it is OK. see picture.

Sans titre.jpg

For the SSD speed i found a solution. I disabled the Intel VMD in UEFI (make some trouble thenafter to boot but the good way is to boot in safe mode). 

Now everything is OK : GPU at 16, all nvme at 4 (2xNVME SSD installed into Hyper M2 board and the board in PCIEX(G4).

Yours faithfully

 

Yes, you are right. The Intel 14900KF CPU can handle 20 PCie lines (version 4 or 5), i.e. x16-x4 or x8-x8-x4.

Yours sincerely