Perhaps there is an issue with your AMD CPU versus Intel CPUs. If the game slows down with many units, then this is a CPU issue, not a GPU issue. I also am having no problems with my Intel Q6600 (@2.4GHz) + NVIDIA 8800GT or ATI Radeon 5850 system. But I recall that a few years ago some people had problems with some games ruining on multi-core CPUs and they needed to change the affinity in order to play properly. Perhaps the problem is with AMDs triple core. Can you run MoW on just two cores? Also check into any BIOS updates or updates for your MB's chipset.
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