ReadyBoost in a usb stick

[livadi]

I recently heard about a 'readyboost' option which suppose to make system faster. Is this about transfer there the virt.memory?
[Win 7 Ult 64 SP1]

Meanwhile this option is disabled in my device because sysmain is disabled... Whats this and how can I enable them both?

 

[Wraith]

Ready boost was made redundant in Win 7 when SP1 was released due to the windows memory management being more efficient, I used to use it with Vista and to be fair it was useless then.

 

[barnsley]

Its useless and was pointless even before SP1.

 

[livadi]

Ready boost was made redundant in Win 7 when SP1 was released due to the windows memory management being more efficient, I used to use it with Vista and to be fair it was useless then.

It works only with SP1?
What supposes to offer?

One more question(I dont know if its relative), may I set virtual memory in the usb stick?