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sounds to me like your motherboard may have some bad ram slots but we should eliminate the possibility of defective memory first
I suggest you download the bootable version of memtest ISO
Memtest86+ - Advanced Memory Diagnostic Tool
here is the how to guide for memtest
http://www.techsupportforum.com/forums/f149/how-to-burn-a-bootable-iso-file-341778.html
then remove all ram except one stick in the slot closest to the cpu / boot the computer and enter into the memtest utility (make sure in your bios the boot order is set to boot from the dvd rom drive as first boot device)
test each memory stick for one hour
if all sticks pass / then I would RMA the board back to gigabyte for replacement
sounds to me like your motherboard may have some bad ram slots but we should eliminate the possibility of defective memory first
I suggest you download the bootable version of memtest ISO
Memtest86+ - Advanced Memory Diagnostic Tool
here is the how to guide for memtest
http://www.techsupportforum.com/forums/f149/how-to-burn-a-bootable-iso-file-341778.html
then remove all ram except one stick in the slot closest to the cpu / boot the computer and enter into the memtest utility (make sure in your bios the boot order is set to boot from the dvd rom drive as first boot device)
test each memory stick for one hour
if all sticks pass / then I would RMA the board back to gigabyte for replacement