I still use onboard with my main computer as it's more than enough for me... However, I have read benchmarks and 2-6FPS is usally the average increase when switching between onboard and some other sound card. Though, differenec drivers for your onboard sound can also make quite a difference.
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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