GDDR5 (Graphics Double Data Rate, version 5) is a type of graphics card memory. It will be the successor to GDDR4. It is currently in its design state, and is reported by several online technology press sites to be available as first samples in mid-2007. GDDR5 products will supposedly be available in late 2007.
Despite the late 2007 suggested launch, given the state of the Graphics industry at this time it appears more likely to see a launch further into 2008.