If Athlon 64 FX-51 has finally managed to defeat Pentium 4 3.2GHz in Quake3, then Athlon 64 3200+ will not be able to repeat this success. Although it is only 2.5% behind Pentium 4 3.2GHz. I would also like to point out that due to larger L2 cache and integrated memory controller Athlon 64 3200+ outperforms Athlon XP 3200+ by about 20%, even though Athlon XP is 200MHz faster.
In Unreal Tournament 2003 the situation is just the opposite: AMD CPUs are ahead here. Note that Athlon 64 3200+ is again faster than Opteron 146.
The same is true for Serious Sam: The Second Encounter and Splinter Cell.