I like many others use my PC to play the odd game or two, to see how SP1 benefits your gaming experience read this article I discovered at ExtremeTech:
Vista Shootout: Hotfixes Vs. SP1

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AMD X2 6400+ 3.2GHz BLACK EDITION::SCYTHE SAMURAI COOLER::GA-M51 M/B::3GB DDR2 6400RAM::GEFORCE 8800GTS320/625/900MHz DRIVER '174.74' BETA::160 RAID 0 SATA2::SOUND BLASTER AUDIGY/'DANIELS' DRIVERS::LITE-ON DVD RW/PIONEER DVD::HIPER 530W MODULAR::THERMALTAKE ARMOUR Jr CASE::RAZER COPPERHEAD MOUSE::VISTA HOME PREMIUM SP1