Image and Video Editing
The same situation can be observed in image processing and non-linear video editing applications. Even the overclocked Athlon 64 X2 3600+ working at 2.6GHz performs pretty traditionally. We can conclude that fast memory makes up for its smaller L2 cache, so when we overclock the processor to 2.6Ghz, it catches up with Athlon 64 X2 5000+.
WinRAR is probably one of the few tests that benefits evidently from a larger cache, because this application is very critical about the memory subsystem performance. However, the performance difference between the two CPUs working at the same clock speed, but featuring very different L2 caches of 512KB and 1024KB, is not as dramatic as you may have expected: 4.7%.