What hits the graphics memory arena eventually ends up in the desktop, & Qimonda have just started shipping these modules. With DDR3 only just starting to make it into desktops, I think it will be a while before we see DDR5, but nevertheless, the process has begun.

"GDDR5 will be available with data rates up to 20GBytes/ s per component, more than double the bandwidth of the fastest GDDR3 memories today and incorporates power saving features."