Question Just bought a RX 7800XT and at current bus it says it runs on PCI EXPRESS 3.0

[fasadasa]

Hello, so I have the following question, my motherboard is an ASUS PRIME B550M-A and in AMD software it says that it runs on PCI EXPRESS 3.0 and I am confused if i am supposed to do something for it to work on PCI EXPRESS 4.0 or maybe my motherboard does not support this?

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[USAFRet]

Hello, so I have the following question, my motherboard is an ASUS PRIME B550M-A and in AMD software it says that it runs on PCI EXPRESS 3.0 and I am confused if i am supposed to do something for it to work on PCI EXPRESS 4.0 or maybe my motherboard does not support this?

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What CPU do you have?

 

[copilu]

Hello, If you have an ATX motherboard, try moving the GPU to the top PCI-E. If not, check CPU support and if none of the first and second is the problem, then try enabling pci-e 4.0 in BIOS (

View: https://www.youtube.com/watch?v=nVHDuudRqpM
)

 

[fasadasa]

What CPU do you have?

r7 5700

Hello, If you have an ATX motherboard, try moving the GPU to the top PCI-E. If not, check CPU support and if none of the first and second is the problem, then try enabling pci-e 4.0 in BIOS (

View: https://www.youtube.com/watch?v=nVHDuudRqpM
)

My motherboard is not atx, i have only one slot i will try enabling it from bios

 

[beyondlogic]

r7 5700

My motherboard is not atx, i have only one slot i will try enabling it from bios

Your cpu isn't a true 5000 series it has PCI gen 3 lanes.

It's quite confusing but not all 5000 are equal.

E.g 5700x has PCI gen 4 code name Vermeer

5700 is limited to PCI gen 3 code name Cezanne

 

[fasadasa]

Your cpu isn't a true 5000 series it has PCI gen 3 lanes.

It's quite confusing but not all 5000 are equal.

E.g 5700x has PCI gen 4
5700 is limited to PCI gen 3

oh, so basically the only way to be able to have pci express 4.0 is to buy a new cpu?

 

[beyondlogic]

oh, so basically the only way to be able to have pci express 4.0 is to buy a new cpu?

Correct.
PCI gen 4 CPUs below

R7 5700x
R7 5700x3d
R9 5900x

 

[artk2219]

Youre not really missing out on anything by running it on PCIE 3.0 X16, maybe 2 - 3% performance on the top end, basically its margin of error, and that was with an RTX 4090. I imagine you would see even less of a loss with an RX 7800 XT.

https://www.techpowerup.com/review/nvidia-geforce-rtx-4090-pci-express-scaling/28.html

https://www.techpowerup.com/review/nvidia-geforce-rtx-3080-pci-express-scaling/27.html