4080 pcie question

[obesepcgamer]

My main board has the following specs: 2 x PCIe 3.0 x16 slots(support x16/x4 mode)

Would a 4080 suffer serious performance degradation if used in a 3.0 x16 slot? Is it advisable to upgrade to a 4.0 main board?

 

[Hofnaerrchen]

You should ask yourself a different and more important question: Will your CPU and display resolution bottleneck the GPU?

 

[obesepcgamer]

You should ask yourself a different and more important question: Will your CPU and display resolution bottleneck the GPU?

CPU is i7-9700k and I just got new monitors. They run at 240hz.

 

[ir_cow]

My main board has the following specs: 2 x PCIe 3.0 x16 slots(support x16/x4 mode)

Would a 4080 suffer serious performance degradation if used in a 3.0 x16 slot? Is it advisable to upgrade to a 4.0 main board?

No more than x8 PCIE Gen4. Which isn't much. Your looking at 1-2% max in some games. 0% in others.

 

[Hofnaerrchen]

CPU is i7-9700k and I just got new monitors. They run at 240hz.

240Hz is the refresh rate, not the resolution but you might (based on resolution, quality settings and game/application) run into a CPU bottleneck.

 

[Tomgang]

I dont think you will lose that much on PCIe gen 3 vs. 4. However , that Cpu will be a bottleneck.

9700K might have 8 cores, but i lags hyper threading. So it is only a 8 thread cpu. Some games needs more than 8 threads. I have seen this CPU peak at 100 % load with slower Gpu.
I dont have a 4080, but i do have a 4090 and for that GPU, even my not that old Ryzen 9 5950X can be a botleneck for my 4090.
I dont know what resolution you play in. But to get full advantage of 4080.
I will strongly advise to get a CPU with 12 threads or more. Meaning 6 cores/12 thread or idealy 8 cores/16 threads.
I am not sure you can get a away just upgrading to a I9 9900K and overclock it. It´s still a CPU from 2018.
I will strongly advice to upgrade to either of these CPU depending on your econemy and needs.
From AMD at least 5800X and even better 5800X3D or Zen 7800X (you might want to wait and se what zen 4 3D chips can do)
From intel 12600K or better yet 12700K or there newest 13 gen 13600K or 13700K. The none K is also a good choise, but they are locked and cant be overclock and runs at lover clockspeed than K models. So they might be cheaper, but also slower than the K models.