This table highlights the differences in performance of the transceivers, LVDS I/O, and DDR2 memory interfaces between the speed grades. The Cyclone® IV GX devices are offered in -6, -7 and -8 commercial speed grades and a -7 industrial speed grade. The Cyclone® IV E devices are offered in -8 and -9 commercial speed grades and -8 industrial speed grade. Further details on the performance across speed grades can be found in the Cyclone® IV handbook.