Dolby 5.1 performance loss??

im getting a 5.1 surround sound card and i just wanna know weather using 5.1 instead of stereo will slow games down?
i'm gonna get Doom 3 and Uru (both games should be great with 5.1) and as Doom 3 is a heafty resource eater i wanna know what sort of performance loss i should expect.

(note: i dont have the Creative Audigy 2ZS [in my sig] installed yet!)

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Pentium 4 <font color=red>3.2Ghz</font color=red> 800FSB (Northwood)
HIS Radeon 9800 Pro 128mb AGPx8
Corsair 1Gb DDR400 (2-3-2-6)
Creative Audigy 2ZS
MSI 865PE Neo series Motherboard
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More about dolby performance loss
  1. I don't think you are going to notice any performance differance at all.

    My Desktop: <A HREF="http://Mr5oh.tripod.com/pc.html" target="_new">http://Mr5oh.tripod.com/pc.html</A>
    Overclocking Results: <A HREF="http://Mr5oh.tripod.com/pc2.html" target="_new">http://Mr5oh.tripod.com/pc2.html</A>
  2. what about if EAX is enabled? (im sure i read somewhere that EAX uses some CPU time).

    __________

    Pentium 4 <font color=red>3.2Ghz</font color=red> 800FSB (Northwood)
    HIS Radeon 9800 Pro 128mb AGPx8
    Corsair 1Gb DDR400 (2-3-2-6)
    Creative Audigy 2ZS
    MSI 865PE Neo series Motherboard
  3. Its handled by the sound card i think...

    Athlon 2700xp+ (oc: 3200xp+ with 200fsb)
    Radeon 9800pro (oc: 410/360)
    1024mb pc3200 (5-3-3-2)
    Asus A7N8X-X
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