I was using a 1GHz T-Bird on an Abit KT7A-RAID, which was rocking, then ruined the CPU during a fan re-installation.
In desperation, I bought a $50 Duron 600, and with my FOP32-1 fan, have that puppy now running at 933MHz at about 40c.
Benchmarks will show that the memory scores aren't as high as they were with my 1GHz. CPU benchmarks, of course, don't compare either.
But when playing my main game, Unreal Tourney, I notice no difference in FPS. Other games and apps show very minor, if any, performance difference. This is subjective, but then, that is really what counts. The PC seems as fast as it did before, despite the benchmarks.
We tend to obsess on benchmarks that show slight differences between components, such as CPUs or video card, but when displayed on a chart those differences can seem large and somehow can force you to justify spending more money on the fastest thing. But at the speeds we are now dealing with, and our subjective feel of the PC in general, I think we upgrade more to beat each other's Sandra scores than to improve our PC experience.
Getting this Duron 600 has made me rethink my excessive hardware buying ways, and knowing that paying more isn't necessarily getting more can help you meet your budget and still rock on the PC. It may have a small cache, and I might not break the 1GHz barrier (although I will ALWAYS try), but the things that matter to me haven't changed.
No guarantees a 600 will reach 933, but it might be worth $50 to see if it can...