For our manual overclocking tests, we used MSI Afterburner. Our best results are as below.
As with all 50 series GPUs I have tested so far, I was able to maximise the memory slider at +2000MHz. Nvidia allows a 10% power increase, and I also added 380MHz to the GPU core.
This overclock netted us some decent gains, in line with the 5070 Ti and 5080, given frame rates increased by 11% in Cyberpunk and then by 10% in the other two games tested. It's certainly more than we would have come to expect based on how things have been going over the last two years.
Power draw did rise accordingly, up to 272W in Plague Tale, which is a 10% increase over stock – so you're not getting efficiency gains, but I'd say it's well worth it for the extra performance.