F5F Stay Refreshed Hardware Desktop Lane Assignment for PCIe Connections

Lane Assignment for PCIe Connections

Lane Assignment for PCIe Connections

T
Thelo58
Member
190
03-13-2022, 06:54 AM
#1
I was wondering if I could get some help with figuring out why my GPU is only running at x8 instead of x16. I have a Ryzen 9 5900x Paired with a Nvidia RTX 3050. My motherboard is a MSI B450 Tomahawk Max II. I have a PCIe network card plugged into the bottom most slot and an M.2 SSD in the only slot possible on the motherboard. My motherboard and GPU Z both say that it's only running at x8.
T
Thelo58
03-13-2022, 06:54 AM #1

I was wondering if I could get some help with figuring out why my GPU is only running at x8 instead of x16. I have a Ryzen 9 5900x Paired with a Nvidia RTX 3050. My motherboard is a MSI B450 Tomahawk Max II. I have a PCIe network card plugged into the bottom most slot and an M.2 SSD in the only slot possible on the motherboard. My motherboard and GPU Z both say that it's only running at x8.

N
Neutrql
Junior Member
2
03-13-2022, 07:18 AM
#2
bottom lane allocation comes from the chipset M.2 connector, which provides dedicated paths. The CPU PCI-E X16 slot offers either 8 or 16 lanes based on the CPU—up to 16 with your 5900X. The RTX3050 card (and GPU chip) is restricted to 8 PCI-E lanes, regardless of slot capacity. This approach mirrors how NVIDIA designs chips, while AMD offers models supporting 4 or 8 lanes.
N
Neutrql
03-13-2022, 07:18 AM #2

bottom lane allocation comes from the chipset M.2 connector, which provides dedicated paths. The CPU PCI-E X16 slot offers either 8 or 16 lanes based on the CPU—up to 16 with your 5900X. The RTX3050 card (and GPU chip) is restricted to 8 PCI-E lanes, regardless of slot capacity. This approach mirrors how NVIDIA designs chips, while AMD offers models supporting 4 or 8 lanes.

M
Maria7300
Member
221
03-13-2022, 08:39 AM
#3
Also check the details on PCIe scaling and performance differences between GeForce RTX 3050 8GB and AMD cards.
M
Maria7300
03-13-2022, 08:39 AM #3

Also check the details on PCIe scaling and performance differences between GeForce RTX 3050 8GB and AMD cards.

A
ardvark090
Member
57
03-16-2022, 05:11 AM
#4
Thanks!
A
ardvark090
03-16-2022, 05:11 AM #4

Thanks!

M
MuffubZ
Junior Member
35
03-16-2022, 06:42 AM
#5
Thank you!
M
MuffubZ
03-16-2022, 06:42 AM #5

Thank you!