Tim - Belgerog. Arma is cpu bound and it’s a 1:1 ratio based on clock performance. So if you have a 2500k processor at 3 GHz, it’s going to be esily outperformed by an older i920 chip OC’ed to 4.2 Ghz.
I’ll have to go back, but basically every Mhz you add, is another 2 AI you can field without a frame rate loss. So when you go from 3GHz to 4.2 GHz you’ve added 240 AI to a battle with no performance hit. When you look at the scale of battles, that’s pretty huge. The issue with buildings is each building has AI points of use. When you get into advanced editing you can see hundreds of thousands of individial points laid out. This makes buildings crush the processor. Most people think it’s just because there’s buildings, and if you have a medicore graphics card this will be true… it will have trouble with the poly count and fill rate. But it’s the AI stuff that’s the real killer.
Make sure you turn hyperthreading OFF when you OC. Hyperthreading actually slows down ArmA2, it makes your processor run hotter, lowers your stability at max OC. Having the cpu run 4 software virtual processors in addition to the real ones is not good for games.