I have a pair of HP Compaq laptops, V2000 series. These originally came with Semprons in them, and I bought a Turion 64 ML-42 and put it in one of them, and a ML-34 into the other.
I am considering buying a ML-40 for the slower laptop, but I was wondering, since the ML-42 only has 512K cache on it, would it make my system faster to replace the ML-42 with an ML-40? I know the processor speed is 200 mhz less with the 40 than the 42, but would having 1 MB cache size allow the slightly slower processor to actually perform better than the slightly faster cpu with half the cache? If so then I will just pick up an extra ML-40.
According to passmark there are only 2 samples of the ML-42... which means the score is highly subject to inaccuracy. Whereas there are over 40 samples of the ML-40. IF the memory controller works the same way on those CPUs as the next generation the RAM will run 5% faster on the ML-40 than the ML-42. The cpu is listed as a Single channel DDR1 memory controller; if this is accurate (which I assume it to be) you will find better performance in the ML-40! However, there will be no perceivable difference between the two and you should not switch the ML-42 machine to an ML-40 unless you have parts on hand for free.
Technically there will be circumstance when the 200MHz increase will serve you better - however, these will not come up nearly as often as the extra cache will on the single-channel memory configuration! Especially if you have integrated video.