Windows cache is HUGE, as in the entire RAM of your system.  It swaps program data that was used only minutes ago out in order to increase the disk cache size and often actually degrades performance by doing so.
Right now on my 512MB system I just checked and the amount of RAM being used as disk cache is 310MB.
			
			Right now on my 512MB system I just checked and the amount of RAM being used as disk cache is 310MB.
				
		
			
	