I recently installed the SB Audigy 2 ZS on my system. I was okay with the onboard audio (Realtek AC97, ALC650) but read somewhere that a PCI sound card would free up the CPU for better performance. However, my 3D Mark03 score dropped slightly (9987 to 9923 - no overclock). Can someone give me a better understanding of what's happening here? Does the onboard audio put more of a load on the CPU? I like the sound upgrade but am very much not wanting to give up a shred of video performance if I don't have to.