When using such a powerful GPU, might as well jump to the DDR 5 platform. You will get a lot of benefits like being able to use faster storage. It won't impact gaming outside of loading times, but overall snappiness of the system will be noticeable

I don't think there's a difference between PCIe 5 and 4 since current hardware can't use those speeds (neither gaming nor storage will have a noticable difference), but 3 to 4 will have an impact

Also I'm not sure if your mobo supports ReBAR, but that's another improvement for certain titles

I say go for the GPU that will benefit your use case the most.

AMD has more VRAM. There are games coming out that actually use more than 12GB at 4K. But in ray tracing it's just slower, upscaling looks worse, FSR 3 is not fully fixed yet.

That said, Nvidia is cringe in Linux so I won't be purchasing an Nvidia card next, just too many bugs in Wayland

What resolution are you running? 1440p or below, id definitely upgrade. Even at 4k i found a 20% increase from a similar cpu upgrade, while using my 6800xt. If you can afford it id do it all at once!

I noticed a pretty substantial increase in performance upgrading my 6700K to a 7800X3D at 1440p on a 5700XT. So you’re probably going to be missing out on quite a bit of performance by just upgrading the GPU

CPU upgrade is necessary as it will bottleneck even your current 1070 in some games. This will get worse with a new GPU. I had the 6700k and got no performance improvement upgrading from a 980ti to 1080ti.

Why not buy a 7800 xt ? Its a bit faster and the same price as the 6800xt. I have the same system as you and plan to upgrade to it as soon as the black friday prices drop.

If you run Windows, that CPU is not oficially supported by Windows 11 and might be something to keep in mind.

Just check if the CPU is the bottleneck or not? Then you know. Look at GPU and CPU utilization while playing (or whatever). If the CPU is at 100 % it is the CPU. If the GPU is maxed out when then a bigger GPU can help. When neither GPU nor CPU are maxed out, a single thread seems to be the issue, at which point upgrading does not help much.