used, for sure.
32 shaders and up will make a difference.
a bud plays left 4 dead , gave him my 9400gt pci and he used that for physx lol. made quite the difference(smooth vs lagging) at a certain resolution/eye candy
some folks tested things out and a gtx 260 will make quite the difference.
now keep in mind that a 100 something watt second card brings in, so chose wisely
i say at least 8800gt, they can be found for 50 bucks
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