Poor scaling in WinRAR yields unimpressive results. Most of the Intel processors clump up, clearly not affected by core count, clock rate, or architecture.
Better-optimized for multi-core processors, the three six-core CPUs stand out in our 7-Zip benchmark, the -4960X barely leading the pack.
Our WinZip chart includes several results, since we first test using the CPU cores, and then follow that up by enabling OpenCL acceleration to offload some of the work. Of course, we know from talks with Corel that the GPU only kicks in on files larger than 8 MB. Because our 1.3 GB archive is a mix of different sizes and types, only some of this benchmark is aided by turning on OpenCL.
The longest bar, in black, represents maximum compression, also performed on the CPU. That’s the one we’re sorting by, and the Core i7-4960X takes a first-place finish. The less-taxing processor-based test, in red, is won by Intel’s Haswell-based Core i7-4770K and followed by Core i7-4960X. OpenCL acceleration throws the numbers off slightly, favoring Haswell first, Ivy Bridge second, and Ivy Bridge-E third, though Intel’s processors all fall within a fairly tight margin.