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Even quake III doesn't take "full" advantage of dual cpu setups. I have 4 Dual CPU machines - and have run Quake III with r_smp 1 (which turns on support for smp) and I usually only got a difference of about 2-5 fps on my benchmarks - and sometimes it was for the worse. I haven't seen any games really take advantage of it yet. Although, I did read that Unreal Tournament 2003 will offload sound processing to the second cpu if present - but I haven't run benches to confirm this. My dual CPU setups range from Dual PIII 733 to Dual 2.8 Xeons. Oh yeah, to restate what Lasereth said, the Athlon would trash that slow dual setup in gaming.
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