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Just because a CPU has a high clock speed (e.g. in GHz) doesn't mean that it is powerful.<ref> http://www.computer-hardware-explained.com/megahertz-myth.html</ref> For example, a 4GHz Pentium 4 is much, much less powerful than a 3GHz i5. Though "i5" is quite vague, as that could be any of the generations or models, P4s are just that weak. Newer CPUs are almost always better. Though the particular architechture does matter. A common misconception is that a higher CPU clock speed guarantees improved emulation performance. Although clock speed is one of the main factors for good CPU performance, it is not the determining factor. Newer CPUs generally perform better than older ones at similar clock speeds. For example, a 2.4&nbsp;GHz dual-core Intel Core 2 processor will generally outperform a 3.2&nbsp;GHz dual-core Intel Pentium D processor. Even though the Pentium D is clocked higher, the Core 2 Duo is faster due to the Core microarchitecture of the Core 2 Duo having so much higher [[instructions per clock]] than [[Netburst]] microarchitecture of the Pentium D that it can do more [[instructions per second]] despite having lower [[frequency]]. This is true of many modern Intel vs AMD processors<ref>http://forums.pcsx2.net/Thread-CPU-Benchmark-designed-for-PCSX2-based-on-FFX-2?page=107</ref><ref>https://forums.dolphin-emu.org/Thread-new-dolphin-cpu-benchmark-no-game-required?page=15</ref><ref>https://forums.dolphin-emu.org/Thread-new-dolphin-cpu-benchmark-no-game-required?page=15</ref><ref>http://translate.google.com/translate?act=url&depth=1&hl=pl&ie=UTF8&prev=_t&rurl=translate.google.pl&sl=auto&tl=en&u=http://pclab.pl//art55934.html</ref>, as the high-end Intel processors are more efficient than the high-end AMD processors. Main reason for that is because Intel processors have higher performing [[floating-point unit]]s,<ref>http://wccftech.com/ultimate-cpu-gpu-floating-point-performance-battle-amd-intel/</ref> <ref>http://www.anandtech.com/show/7711/floating-point-peak-performance-of-kaveri-and-other-recent-amd-and-intel-chips</ref> far greater [[cache]]/memory [[bandwidth]]/lower latency<ref>http://vr-zone.com/articles/ivy-bridge-e-i7-4960x-vs-amd-fx-9590-battle-2013-flagships/54295.html/2</ref><ref>http://www.extremetech.com/computing/159619-5ghz-showdown-overclocked-5ghz-amd-haswell-ivy-bridge/2</ref>.

Not every CPU can be over clocked, nor does every motherboard/BIOS support it. An advantage of the intel Intel K series is that they are unlocked and can easily be overclocked. So if it can't play a game currently then you can, in many cases, overclock it until it does. Laptop CPUS often cannot be overclocked due to BIOS limitations.