The KT133A chipset took the market by storm as it is one of the cheaper alternatives to DDR. Other than Gigabyte, a number of 2nd line companies have also launched their KT133A mainboards. Gigabyte is again the first 1st line company to launch their KT133A solution - Gigabyte 7ZXR(2.1)
Gigabyte 7ZXR is the second revision of the popular GA-7ZX. The second edition is GA-7ZXR which is a KT133 mainboard with RAID. GA-7ZXR (2.1) is the one that is based on the KT133A chipset and includs RAID using Promise chipset.
FULL STORY @ OCWORKBENCH (http://www.ocworkbench.com/hardware/gigabyte/7zxrr21/7zxr21p1.htm)