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For comparison: On a high-end i7 (I've tested a 4770s) the CPU load for Stereo Tool with everything enabled (FM, including Composite Clipper and Stokkemask) is about 6-7%.
I haven't seen any recent AMD numbers so I can't compare, and also you need to keep in mind that the reported CPU load on Intels is generally skewed towards lower numbers because of Hyperthreading (if you use all cores - but without Hyperthreading - at 100%, you see a CPU load of 50%, but if you also fill the Hyperthreaded cores you only gain about 30% in performance, but the reported CPU load will double to 100%.)
And this is why a pure per-core load should be measured, instead of overall CPU usage. But it's difficult since you can't distinguish physical cores from the hyperthreaded ones. It applies to both Intel and AMD (AMD claims the 8 cores in Bulldozer/Vishera are real, but in fact they aren't - only four of them have all units - ALU and FPU).
In addition Windows 7 has a strange threading issue and the threads appear as if they were all mixed.