Hires fix performance on AMD

[Enferlain]

Can you guys tell me what the speed and total time and vram usage is for these

dpm++ 2m karras 20 steps latent nearest exact 2x 640x640/640x1024 and 1.5x for 640x1024?

I tried locally after months of colab gpu, and normal generation seems about 2-2.5x faster on a 6800xt, but hires fix seems to shit the bed. I even got an oom error once.