x264 CPU scaling


So, i google’d about 32-bit vs 64-bit performance on x264 and look what i’ve found, a full benchmark and comparison between number of core(s), die-shrink, and architecture (Intel vs AMD).

x264 CPU Benchmark Results

Although it might be outdated, but it gives general performance of x264 within different CPU(s).

In the benchmark, it shows that:

  1. More cache doesn’t always mean more performance (~2-5% performance difference)
  2. 45nm Core2Quad is faster than its 65nm counterparts (~6-13% performance increase, although it could be attributed to higher L2 cache)
  3. AMD’s phenom/k10h architecture is generally similar in performance compared to Intel’s Core
  4. Windows Vista gives slightly slower performance than XP (~1-2% decrease)
  5. With overclocking, x264 gives slightly linear performance increase

EDIT: it looks like there are more updated benchmark result from TechARP (with Sandy Bridge included). below is the 2nd pass result from x264 HD Benchmark 4.0

x264 HD Benchmark 4.0 Pass 2

Source: TechARP

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