Gigabyte GA-6IEM User Manual page 61

? Host/DRAM Clock Ratio
Memory Frequency = Host clock X 1.0.
?1.0
Memory Frequency = Host clock X 0.75.
?0.75
Depend's On SPD Data. (Default value)
?Auto
? Memory Frequency(Mhz)
?The values depend on CPU Host Frequency(Mhz) .
57
BIOS Setup