Despite Intel has yet to announce the upcoming Core Ultra 9 285K (though there’s more than enough leaks to know it is happening), popular benchmarking software PassMark has already announced the aforementioned CPU as the new winner in the single-thread ranking.
Intel Core Ultra 9 285K: 8% Faster In Single-Thread

PassMark Software announced on X (Twitter) the new Arrow Lake-based processor as the new leader in the single-thread CPU Mark ranking, with an 8% margin over the current-best, the Intel Core i9-14900KS. Notably, the 14th Gen processor has a boost clock of 6.2GHz, whereas the Core Ultra 9 is rumored to hit up to 5.7GHz – this means we should see a pretty solid boost in IPC (instructions per clock) with the new (presumably) Lion Cove P-core architecture.

In fact, the benchmark entry has given us a pretty detailed look at the processor’s specs: 8 P-Cores with 5.7GHz boost clock, and 16 E-Cores with 4.6GHz boost clock. This entry also suggests that hyperthreading is no longer present, and multi-core performance is 22% slower than the Core i9, although it’s worth taking a small grain of salt here given that PassMark doesn’t rule out the possibility of it being an engineering sample, but results “are looking good.”

We also don’t know what are the power targets this CPU is running on, and this can be a major factor in determining the processor’s multi-core performance. Intel is reportedly raising the peak power limit up to 295W on the top-tier models to give it extra boost that might be just enough to surpass the current flagships despite the lack of hyperthreaded cores.
Source: Videocardz
Pokdepinion: Looking good indeed – although the elephant in the room at this point really comes down to multi-core performance, now that hyperthreading is gone.