It's not really a fair comparison, the 5900X being compared only scored 20.2K vs the 12900K's >27K. Without LN2, the 5900X can't overclock high enough to reach that score, and even a 5950X will need considerably more watts than stock to reach it, its stock score is only about 25.5K. The 12900K is strong enough that AMD is going to have to push up their wattage too.The performance is impressive no doubt. But to use that much power to get it really shows how damn good the 5000 chips are.
And indications are that the 12900K when dialed back a little has very good performance/watt, 117W CPU package power for a score of 25K with an undervolt:
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