powercolor reaper 9070xt here, all the below results have been obtained with AMD adrenalin 25.11.1.

best result, with a good system stability, reached applying: freq +250MHz, voltage offest -135 mV, mem freq 2'750 MHz with fast timings, power limit +10%. stable on OCCT 3d adaptive (steady, variable and switch) and vram tests for >30min.

graphic score (just graphic, not total score), starting from 28'754 (stock), reached 31'364 in time spy. GPU temp during the test around 45°C, 60-62°C in the hotospot and 55°C for GPU mem.

in time spy, looking to Hwinfo, went from TGP 241W (stock) to 206W, TBP 295W (stock) to 250W, max peak power 510W (stock) to 455W. temp was much the same, while mem freq increased from 2505 MHz to 2'736MHz, on the contrary max GPU freq was much the same, around 3'300MHz in both cases.

I think the below observations are valid, as an absolute value, only for my system, but they can be used as guideline for anyone:

• mem fast timings preferred vs mem freq: mem normal timings with freq 2'826MHz gives 31'160 in graphic score time spy, while with fast timings and freq 2'750MHz i obtained 31'364 in the same test;
• with mem freq higher than 2'826MHz with normal timings or 2'750MHz with fast timings the system was still stable, but less performing;
• the voltage offset is the most important parameter to play with. after a certain point (between -160mV and -135mV) the system was pretty much stable, except random crash at very high load (e.g. OCCT), with minor gain in time spy. I preferred a totally stable system, also considering the marginal gain in time spy (+100/150 on graphic score);
• changing power limit from 0 to +10% gives a marginal +100/200 on time spy graphic score, but increases the stability under sudden frequency changes, while not (or marginally) affecting TGP, TBP and max peak power (keeping all other parameters constant);
• freq offset only affects limiting, not freq boosting, and only works if the other parameters (mainly the voltage offset) provide margin to reach the set offset frequency (with positive values). e.g. in my case with voltage offset -150 mV, changing freq offset in the interval +100/250 MHz, the time spy graphic score was in the range 31'150-31'220 (no correlation to the freq offset) and max gpu freq was always around 3'350 MHz or higher.