ASUS P7P55D - Where is the memory multiplier setting?

Hi All!

This might seem like one of the more noob-ish questions around, but I just have to ask...

I'm trying to follow Miahallens guide to overclocking, and I kind of get stuck on the part where I'm supposed to set the memory multiplier. I just can't find it!

All I have in my Bios setup (As the title says Asus P7P55D) is an option to set the DRAM Frequency. It gives me "Auto", "DDR3-800Mhz", "DDR3-1066MHz", "DDR3-1333MHz" & "DDR3-1600MHz".

Now - either the presence of the multiplier option is depending on another change being made to "show up" or it doesn't exist on this MB. And I can't figure out which it is.

If it don't exist, do I just set the frequency to 1066Mhz (aiming for something around 4GHz and I have Kingston HyperX DDR3-1600 installed) and roll with that?

Edit: Or does these settings mean I force a frequency independently of the rest of my settings (e.g. set 1600 my rated 1600MHz and be happy with that?)

Thanks in advance!

Asus just lists the available DRAM frequencies instead of actual multipliers. So for example DDR3-800Mhz = a 2:6 FSB : DRAM ratio, or a x6 memory multiplier. Since the listed frequencies are based off the current BCLK, and the default is 133MHz, the values you listed are the result of multiplying the 2nd number in the ratio by the BCLK...

DDR3-800MHz = 2:6 (133MHz x 6 = 800MHz)
DDR3-1066MHz = 2:8 (133MHz x 8 = 1066MHz)
DDR3-1333MHz = 2:10 (133MHz x 10 = 1333MHz)
DDR3-1600MHz = 2:12 (133MHz x 12 = 1600MHz)

So if the BCLK was set to 200MHz for example, and you set the DRAM Frequency to 1600MHz, the FSB : DRAM ratio would be 2:8.

Ok... I started to "suspect" just that now that I'm slowly pushing my BLCK up, and the RAM frequency "follows".

Thanks for confirming that for me!