No worries. When this and other boards first came out, it WAS a problem. Memory required more voltage, and no one could boot the first round of 965 boards unless they first used a stick of 1.8V memory to get into BIOS to increase the DDR2 memory voltage so that they could use sticks that used 1.9-2.1 (or more) volts.
I am using the DS3, though, and put in some Corsair 800Mhz 1.9V memory and it booted right up. Most everyone else has he same experience. I'm not sure what Gigabyte or other vendors have done to increase compatability, but I'll bet that the S3 will boot into BIOS long enough for you to increase voltage for whatever memory you are using