GPU using only 8 lanes on a 3.0 x16

FrozenHydrangea · May 21

i recently found out that my GPU is only using 8 lanes instead of 16 through the radeon software. someone said to me that since i have a m.2 mounted its normal, but shouldnt my pc have more free lanes to spare for my gpu to use?

My specs:

Ryzen 5 3600

DDR4 16GB

M.2 500GB (mounted on a m.2, 3.0 x4)

RX 7600 8GB (mounted on a 3.0 x16)

B450 Tomahawk Max

Needfuldoer · May 21

15 minutes ago, FrozenHydrangea said:

RX 7600 8GB

You have a PCIe Gen4 x8 GPU, so it only has up to 8 lanes of connectivity even if it's in an x16 slot. It will run at Gen3 x8 speeds in your computer.

https://www.techpowerup.com/gpu-specs/radeon-rx-7600.c4153

It works because PCIe is forwards and backwards compatible, but it only has half the bandwidth it would in a Gen4 slot (or of it was a PCIe 3.0 x16 card).

15 minutes ago, FrozenHydrangea said:

someone said to me that since i have a m.2 mounted its normal, but shouldnt my pc have more free lanes to spare for my gpu to use?

According to your motherboard's manual, the M.2 slot only overrides a couple SATA ports, not any of your PCIe slots.

FrozenHydrangea · May 21

7 minutes ago, Needfuldoer said:

You have a PCIe Gen4 x8 GPU, so it only has up to 8 lanes of connectivity even if it's in an x16 slot. It will run at Gen3 x8 speeds in your computer.

https://www.techpowerup.com/gpu-specs/radeon-rx-7600.c4153

It works because PCIe is forwards and backwards compatible, but it only has half the bandwidth it would in a Gen4 slot (or of it was a PCIe 3.0 x16 card).

According to your motherboard's manual, the M.2 slot only overrides a couple SATA ports, not any of your PCIe slots.

oh ok so its just the fact that my gpu is 4.0, i thought it would still use all the 16 lanes anyway but i guess i thought wrong. i was thinking that this might have been the reason why i keep crashing on fortnite (i have made another post for that) but i guess i have to keep troubleshooting for that problem. thank you