Question If I disable integrated GPU, will I have access to all PCIe lanes?

[ajkelsey]

Currently, I have an AMD ryzen with integrated graphics and a PCIe graphics card. Because the CPU has integrated GPU, the PCIe GPU only has access to 8 lanes. If I get a MB that allows me to disable the inegrated graphics, would that free up all 16 lanes?

CPU: AMD Ryzen 7 3700X
CPU cooler: AMD
Motherboard: MSI B450I - E7A40v2.2
Ram: 16GB
SSD/HDD:
GPU: Geforce GTX 1650
OS: Windows 11

 

[Lutfij]

Welcome to the forums, newcomer!

Currently, I have an AMD ryzen with integrated graphics and a PCIe graphics card.
Instead of being vague, can you please state your current system specs like so:
Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

Moved thread from Graphics cards section to Systems section

 

[ex_bubblehead]

Currently, I have an AMD ryzen with integrated graphics and a PCIe graphics card. Because the CPU has integrated GPU, the PCIe GPU only has access to 8 lanes. If I get a MB that allows me to disable the inegrated graphics, would that free up all 16 lanes?

You would be extremely hard pressed to see any difference in performance between x16 and x8 with any modern video card.

 

[ajkelsey]

You would be extremely hard pressed to see any difference in performance between x16 and x8 with any modern video card.

Really? It just seems that with newer cards, there would be more usage of the PCIe lanes. Could upgrading to a newer graphics card that is 3x faster be worthwhile?

 

[rgd1101]

AMD Ryzen 7 3700X don't have igpu

 

[ex_bubblehead]

Really? It just seems that with newer cards, there would be more usage of the PCIe lanes. Could upgrading to a newer graphics card that is 3x faster be worthwhile?

Yes, really. "It just seems" has nothing to do with it. 8 lanes is more than enough, even with the highest end card available.

 

[ajkelsey]

AMD Ryzen 7 3700X don't have igpu

I just double checked and your are right. I don't know why I was thinking it did. I must have gotten it confused with another chip I purchased. Never-the-less, this was all very helpful!

 

[BFG-9000]

Well this is a puzzle. GTX 1650 has an PCIe 3.0 x16 bus interface, and MSI B450I has a single PCIe 3.0 x16 slot (it remains PCIe 3.0 even if you put a PCIe 4.0 capable processor such as 3700X in it, since AMD disabled that capability with an AGESA update sometime back in 2019). How exactly are you measuring that it's not running at x16 when under load? It's supposed to idle at a narrower bus when not under load.

In any case the old desktop APUs (with a G at the end of the model number) or mobile ones (with a U) were permanently wired at x8 so even if you disable the IGP it's still only x8 to an external GPU. There is some controversy on whether the 4000 and 5000 series are still like this