Any solid state medium used for caching would help a system with 512MB of RAM. You can't cripple the system to disprove the gains of Readyboost. 512MB of RAM was never enough for Vista to begin with...
From your link...
Which part of this are you not understanding as this agrees with what I am saying
Although it shouldn't be a surprise to you, ReadyBoost impacts application loading, closing and switching time, but CPU intensive tasks aren't impacted nearly as much. As such, most of our conventional benchmarks, even when running with only 512MB of memory, don't serve as a good benchmark for ReadyBoost. If your system has so little memory that it is swapping to disk while running a single task then you're in trouble, and ReadyBoost isn't going to save you.
From your link...
Which part of this are you not understanding as this agrees with what I am saying