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Extra cards require additional system resources, but the first solid indication of a problem for quad SLI appears at our lowest S.T.A.L.K.E.R. benchmark test setting. From there, increased details burden the cards more than the CPU, and the quad SLI configuration pulls ahead.
Two GTX 460 cards play the game smoothly at all resolutions, but only with AA disabled. Three-way GTX 480 SLI pulls a minimum of 19 FPS in the Sun Shafts test at our highest test setting, so that configuration is probably playable. Anyone who wants to be completely sure their system can play every possible setting in every possible lighting condition will want to step up to quad-SLI.