By Trefis.comIntel ( INTC) has long dominated the server and PC processor markets and enjoyed high profit margins in both. According to our estimates, these products together constitute around 80% of Intel's stock value. But it's not clear that Intel will be able to maintain both its dominant market share and its elevated margins. Rival chipmaker AMD ( AMD) now sells the cheapest server processors on the market. More important, AMD's latest processors deliver better performance ratios than Intel's, measured on both per-watt and per-dollar bases. Below we explain how AMD is putting pressure on Intel's processor market share and underlying profit margins.