Originally Posted by Pirx
Gus is right, this has nothing to do with putting the page file on a flash device.
And he is also right about that idea having no merit. You may notice that the quotes you produced do not mention the paging file anywhere...
what it does say though is that for readyboost devices, they are being used instead of the hdd when the OS needs to page to the hdd (a.k.a when the OS needs to write to the page file).
on the other hand, the article is saying that with superfetch, it will preload programs and data that u are more likely to run next into parts of the ram that is not currently being used.
so thats the difference that the article is claiming.
The more ram you have installed in the system the less likely the OS will need to page to disk, so the less likely it will use readyboost if you have it enabled. So thats why you gain less and less performance from readyboost the more ram you have in your system.
The merit of whether to use readyboost or not will ultimately boil down to how much performance you can gain from using readyboost and how much the flash memory costs vs how much performance gain you get from installing more ram and how much that ram cost.
edit: with more ram, vista will prefetch data (caching ) as well as preventing the system from paging to disk. So you get to kill 2 birds with 1 stone with more ram. With Readyboost, it DOES NOT prevents the OS from paging to disk but will also page to a flash memory stick. But of course, accessing the RAM directly is still alot (100 times) faster than paging to the flash memory stick.