Link: http://techreport.com/reviews/2004q3/geforce6800-comparo/index.x?pg=1Although the GeForce 6800, GeForce 6800 GT, and GeForce 6800 Ultra share the same basic NV40 architecture, there are clock speed and pipeline differences between them. Here's how the three 6800 iterations stack up against each other and ATI's competing Radeon family.