Depends on the card. If it's just for games, you really should get an Audigy 2. It has fairly low CPU utilization and doesn't have a huge impact on frame rates. The benefit of getting the Audigy 2 is that most games are optimized for the hardware... unlike onboard sound solutions.
SBLive and the first revision of the Audigy were PCI bus hogs, Audigy 2's are very well behaved. My only advice is to just install the drivers for any creative labs product. The other software that comes with it are typically very buggy and are also the cause of a lot of the problems with the cards.
P4 2.6C, Thermalright SP94/Panaflo 92MM M1A, IC7 Max3, Swifty MCX159, 1GB Geil PC4000 Ultra Plat, Radeon 8500, Audigy 2, 2X WD Raptor RAID 0, WD 250GB SE, Plex 708A, 166SDVD, LianLi PC75, XP Pro.