Gaming
Gaming now, and 3DMark2001SE.
There's also practically no difference between the different configurations in 3DMark2001SE.
The very same can be said for UT2003's results.
The results all appear to prove one thing; there's practically no performance increase, given a similar clock speed, between DDR400 2-2-2-5 and DDR500 2.5-3-3-7. If you want to run your Athlon 64 or Pentium 4 at stock speeds there's nothing currently better than a crop of RAM that all share excellent timings of 2-2-2-5. Mushkin's L2 V2 PC3200 is a prime example of such memory.