What's a better memory combo

hey everybody. I was running 4 sticks of 2 gb of ocz ram for a total of 8 gigs on my sister. I had an old 4000+ processor. The RAM was running dual channel at 800 mhz. I upgraded my processor to a Phenom II 720. Unfornatualy, the memory started to run in single channel or unganged mode. I bumped the speed up to 1066 mhz.

Ok, well I guess I can remove two of the sticks and run 4 gigs in dual channel. My question basically is with 8 gigs, is there a noticeable difference between dual channel and single channel mode? The dual channel is only supported at 800 mhz I do believe but with only 4 gigs....however, I can run the single channel 8 gigs at 1066. Thanks for any comments.

Unganged mode runs better with AMD systems. So leave it there, However Dual channel is not the same as Ganged mode.

Ganged is better for Games since it reads all the memory as a whole I suppose, But unganged is better for other tasks, Multitasking etc. I may have this Mixed up or whatnot so please correct me if I'm wrong.