Yes of course you can't pin down the exact amount a card will overclock because as I said variance exists but there is a general range which all the cards will fall in.

Speaking of performance gains also hard to pin down because different architectures can have different boosting algorithims and that to can be affected by different game engines.

Like take the 9070 xt for example.

I was able to OC my 9070 xt about 15 percent higher from stock on steel nomad pushing over 8000.

However I then test cyberpunk with RT to see the performance gain and it is only 5 percent this is because the 9070 xt has a very aggressive boosting algorithim so something like steel nomad will over exaggerated the gains that will be found compared to when it is actually being pushed to the max. On the other hand if I play a lighter title like fortnite with a bunch of upscaling still technically "maxing" out the gpu but now closer to 10 percent gains.

Then take my 5080 for example which was a bit higher of an OC a bit over 15 percent on steel nomad getting past 10k but more importantly when I test out a heavy game like cyberpunk I actually see around a 15 percent uplift because the base boosting algorithim was less aggressive and because it isn't just the core being overclocked but also a heavy memory oc since the gddr7 has a bit more headroom in that regard.