Intel 12th Gen Core Alder Lake Performance Review: Chipzilla Is Back
LAME XP Audio Encoding
x265 Video Encoding Benchmark

The new 12th Gen Core i9-12900K can't quite catch the Ryzen 9 5950X in this video encoding test, but it isn't too far behind and still manages to outpace the 5900X. The Core i5-12600K has no trouble dispatching Intel's previous flagships, however, and hangs tight with the Ryzen 7 5800X.
Cinebench R23 Rendering Benchmark

POV-Ray CPU Ray Tracing Benchmark
The overall performance trend in POV-Ray mimics Cinebench. Here, we also see the Core i9-12900K outpacing all of the mainstream processors in both the single and multi-threaded tests -- it's only the 24-core Threadripper that finishes out in front. The Core i5-12600K also continues to impress, with its excellent single-thread result and multi-threaded result that lands between the Ryzen 9 5900X and Core i9-11900K.
Blender Rendering Benchmarks
Blender is a free and open source 3D creation suite that can handle everything from modeling, rigging, animation, simulation, rendering, compositing and motion tracking. It has a purpose-built benchmarking tool that will track the time it takes to complete rendering a particular model (or models). We used the CPU-focused bmw27 and fishy_cat models for these tests...

The Core i9-12900K's and Core i5-12600K's results are somewhat mixed in the Blender benchmark. When rendering the bmw27 model, Intel's newest chips perform exceptionally well, finishing in the same positions as they did in the POV-Ray and Cinebech tests. With the fishy_cat model, however, the 12th Gen processors drop down a couple of rungs, and end up trailing the Ryzen 9 5950X or Ryzen 7 5800X.
Y-Cruncher Multi-Threaded Pi Calculator

The new 12th Gen Core processors also performed well in the Y-Cruncher benchmark. The Core i9-12900K once again outran the Ryzen 9 5950X and the Core i5-12600K dispatched the Ryzen 7 5800X and previous Intel flagship Core i9-11900K.
STARS Euler3d Multi-Threaded CFD Benchmark
This benchmark is multi-threaded, but is also dependent on platform bandwidth, and cache and memory latency, so the final results are not determined by compute performance alone. Cache sizes / speed and memory bandwidth affect the score as well...

Their massive memory bandwidth, larger caches, and high-performing P-cores push the 12th Gen chips up the ladder in this benchmark as well. The Core i9-12900K lands in the pole position, ahead of every other platform we tested, and only the Intel HEDT Core i9-10980XE and Ryzen 9 5950X are able to outpace the Core i5-12600K.