Turbocache means it steals your system RAM instead of having it's own onboard RAM. May result in sluggish performance, also you'd need more RAM to supply. Also, just a little note I'd like to add. Although DDR2 does boast up to twice the speed/bandwidth of DDR RAM, the timings are much more loose/high which may result in a small net performance gain. As I believe AMD systems are more reliant on the timings than high bandwidth(Intel).