I enabled mine (3gb switch)  and it works great. Dont go above 70% though it starts to be counter productive.
Also what is your drive array, single raid 0 ?
I went to 2 raptor 10k rpm drives in raid 0 and 1 sata 150gb as a back up for files. "in the name of all things holy!" Is it fast.
+ when doing bigger pics the bigger card rolls through the stuff better when loaded (multiple apps) down then my 7600 did,
	
		
			
		
		
	
			
			Also what is your drive array, single raid 0 ?
I went to 2 raptor 10k rpm drives in raid 0 and 1 sata 150gb as a back up for files. "in the name of all things holy!" Is it fast.
+ when doing bigger pics the bigger card rolls through the stuff better when loaded (multiple apps) down then my 7600 did,
 
				 
 
		 
 
		
 
 
		