We found the problem. It is causing by the Gigabyte bios auto detection. It boots DDR800 CL4 ram up with CL3. There is no way to boot CL3 up at DDR2 800 and also with 1.8v.

If you have ram that using CL5, I would suggest use that to boot up the motherboard and set your bios at CL4 on DDR2 800. Save the bios and swap to 2GBZX. That will solve the problem. However, this problem is actually causing by Gigabyte bios not the