Probably the first DDR4 benchmarks for Intel's upcoming Alder Lake-S desktop processors have leaked today via PugetBench. Overall, the performance on DDR4 seems good at least in the case of this.
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Leaked performance numbers for Intel's upcoming Alder Lake-S Core i9-12900K in Adobe's After Effects (AE) suggests that the upcoming Intel CPU could disappoint, at least in some of the workloads.