French website Clubic.com reveals new drivers has been posted by Creative for both the Audigy and Audigy 2 series of sound cards. Those drivers are called 'Beta performance' and fix the following :

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Sound Blaster Audigy performance increased by 10%-15% for EAX ADVANCED HD

Number of simultaneous voices has been doubled from 32 to 64

Reverb presets setting by game audio engine is now on average 10X faster

EAX Morphing performance enhanced, typically yielding a 2X improvement in frame-rates for morphed sections.

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Clubic.com

Thanks to Mr A