It looks like you have the F3g BIOS and it didn't help. I have PC-6400 and it didn't help. What stepping is your CPU (cpu-z should say)?
I don't want to be negative, but we may be snakebit twice. E6600 stepping 6, and DQ6 motherboard. I fear that you may upgrade your memory, then upgrade your board (down to a DS3) and still be S.O.L. I haven't seen results of the E6600 stepping 6 on the DS3 or DS4 (mostly Allendales, with strong results) or on ASUS or Intel boards. I do wonder if this stepping 6 CPU is the weak link.
On a positive note, Anandtech reported "...we were able to clock this board to an impressive 376FSB. Gigabyte has sent us test results with a new B2 stepping 6 X6800 showing a fully stable system running at 6X498 with the current D27 BIOS. The board ran extremely cool during our overclocking tests indicating a well engineered heat pipe system, although the area around the CPU would need to be actively cooled if a liquid cooling system is utilized. During testing for the maximum FSB clock we ran into the BIOS issues and were not able to extend past the reported 376FSB due to our inability to set the MCH and FSB termination voltages. The only other noticeable drawback in overclocking this board is the lock on increasing the CPU multiplier when utilizing the X6800. We look forward to providing a full review of this board in the near future." http://anandtech.com/mb/showdoc.aspx?i=2797&p=8
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