> 7950x will use considerably higher power (105W -> 170W)

The 5950X uses 180W at full load. Some measure as high as 230W. The 105W figure reported as "TDP" was a mistake.

Not sure why the specs were a big lie but this is well documented online.

> air-powered cooling being not enough

If you want to turbo to 4.1GHz or better on all cores on the 5950X, you have to spend about $60 on a cooler - water or air. The AIOs perform well. A big AIO will give you 4.5GHz. No turbo air cooling - 3.4GHz - is a waste of money.