Let me repeat myself. the X800xl has for sure 16 pipelines and uses GDDR3 memory. THe X800 has 12 pipelines and uses GDDR3 memory.
The nviida 6800GTs and ultras has 16 pipelines and uses GDDR3 memory. Nvidia 6800 uses DDR memory and has 12 pipelines. The X800XL is the poor man's X850 and is aimed as competition against the 6800GT.
you make it sound as if there's only a few 'special' 6800's that fall into that category...if it's a plain 6800 , then it's not GDDR3....simple as that...it's the GT series and up that has it.