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[BlueManifest]

If you upscale 1080p to 1440p does it have the same cost as upscaling 1080p to 4k since they are both the same internal resolution?

If there is a cost difference is it minimal or large

 

[Skifi28]

The target resolution increases the cost even from the same internal resolution.

 

[BlueManifest]

The target resolution increases the cost even from the same internal resolution.

Minimal or large

 

[Skifi28]

Minimal or large

Significant enough to make a difference I believe.

 

[memoryman3]

Minimal or large

Depends on model. More advanced models of FSR have higher performance impact.

 

[winjer]

If you upscale 1080p to 1440p does it have the same cost as upscaling 1080p to 4k since they are both the same internal resolution?

If there is a cost difference is it minimal or large

FSR2 or FSR 3.1 or FSR4?
And what is the GPU?

 

[BlueManifest]

FSR2 or FSR 3.1 or FSR4?
And what is the GPU?

Any of them I was just curious how it worked if they started from the same resolution

Like is cost difference just 2-6 fps or more like 15-30 fps

 

[winjer]

Any of them I was just curious how it worked if they started from the same resolution

Like is cost difference just 2-6 fps or more like 15-30 fps

It should not be measured by fps cost. But rather by how long the upscale takes to complete.
It is measured in milliseconds. And it depends on the version of FSR and the GPU that is used.
For FSR3.1 it should be around 0.5-1.5 ms. Depending on the resolution and the quality mode. A bit higher for FSR4.
But it depends also on the GPU. A low end GPU will take longer to process the upscale.

 

[dgrdsv]

Minimal or large

The difference in performance between quality presets can be up to 2X, the lower the upscaling ratio is - the heavier is the upscaling process.
The bigger difference is stemming the output resolution though which is why we see games upscaling from 1080p to 1440p only and not to 4K.

This is for FSR2 (FSR3 SR is similar albeit a bit heavier overall):

AMD FidelityFX FSR Super Resolution 2.3.4

gpuopen.com

It's similar with FSR4 but it's up to 4X as heavy vs FSR3 even when running on dedicated ML h/w of RDNA4.

To answer your question of "If you upscale 1080p to 1440p does it have the same cost as upscaling 1080p to 4k since they are both the same internal resolution?" the answer is "no, upscaling to 4K would be considerably more expensive".
6700XT is at 0.9ms when upscaling 1080p to 1440p and at 1.7ms when upscaling 1080p to 4K.

What is a bit counter intuitive is that upscaling from a lower internal resolution would in fact be cheaper than upscaling from a higher one to the same target resolution.
Same 6700XT is at 1.7ms when upscaling 1080p to 4K but is at 2.0ms when upscaling from 1440p to 4K.

 

[vkbest]

If you upscale 1080p to 1440p does it have the same cost as upscaling 1080p to 4k since they are both the same internal resolution?

If there is a cost difference is it minimal or large

Internal resolution is almost no difference. The final resolution is the important metric, because you need more operations and you are going to get more bandwidth limited because higher memory needs.