3700+ for sure, its quicker in current games, and the gfx card will be the weakest part way before the cpu will, it runs cooler, less power consumption.
If those comps are only being used for gaming at this point dual core will not make a difference, and when it does it would be just easier to upgrade the whole comp as it would be outdated anyways.
If those comps are only being used for gaming at this point dual core will not make a difference, and when it does it would be just easier to upgrade the whole comp as it would be outdated anyways.