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Pcie trouble Dark hero z790 with RTX 4090 GPU running x8

VroiteR
Level 8

Config:

Asus Dark Hero Z790

intel 14900k

RTX 4090 Tuf Asus

M.2 990 pro gen 4

M.2 980 

my gpu was running at x8 4.0:

 

VroiteR_0-1703551911393.png

 

 

my M2 990 pro was installed at 2_1 socket.

take a look at mine PCI express conf.

VroiteR_1-1703551910505.jpeg

 

 

if anyones knows something to do for help i will be glad.

have a nice holidays time

1,372 Views
2 ACCEPTED SOLUTIONS

Accepted Solutions

Silent_Scone
Super Moderator

Hi @VroiteR ,

If you take a look at the user manual you'll see that M.2_1 shares bandwidth with PCIEX16(G5_1). This is due to the slot utilising CPU lanes. If wanting the GPU to retain all 16 lanes, you would need to move the NVME to another slot on the board that utilises PCH lanes.

Silent_Scone_0-1703576168754.png

 

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

View solution in original post

1. The performance loss is minimal in both instances (dropping to either 8x GPU lanes or switching to PCH lanes on GEN 4.0 NVME)

2. Yes, this is because of the physical number of lanes available from the CPU. If the system is for gaming, you’d need to weigh up what’s more important and whether you need the storage speed increase. The performance deficit from running the GPU in 8x 4.0 is within 1 to 3%

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

View solution in original post

4 REPLIES 4

Silent_Scone
Super Moderator

Hi @VroiteR ,

If you take a look at the user manual you'll see that M.2_1 shares bandwidth with PCIEX16(G5_1). This is due to the slot utilising CPU lanes. If wanting the GPU to retain all 16 lanes, you would need to move the NVME to another slot on the board that utilises PCH lanes.

Silent_Scone_0-1703576168754.png

 

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

ok, but if i do that, and put mine 990 pro at 2_2 M2 socket, I will not have a loss of performance? about the processor?

and another question if i buy a m2 gen 5 (Crucial T700) and put in m2 2_1 socket, my gpu will still working in 8x?

1. The performance loss is minimal in both instances (dropping to either 8x GPU lanes or switching to PCH lanes on GEN 4.0 NVME)

2. Yes, this is because of the physical number of lanes available from the CPU. If the system is for gaming, you’d need to weigh up what’s more important and whether you need the storage speed increase. The performance deficit from running the GPU in 8x 4.0 is within 1 to 3%

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

So please tell me if I plug the Samsung 990 Pro 4TB PCIe Gen 4.0 x4 NVMe V-NAND SSD into slots M2-3 and M2_4, will it not affect the performance of the SSD? Because the SAMSUNG 990 SSD is originally designed as PCIe Gen 4