When you double the speed you get the final hz.
Note that when you turn on XMP for those Patriot's the XMP profile can change other motherboard settings.
May want to check:
- QPI voltage
- DIMM voltage
There are two sets of 6gb triple channel Patriot kits. THe one I had turns up the QPI voltage and Dimm voltage but leaves the Bclk alone.
THere are other brands that crank up the blck.
Note that this is what they mean when they say that the board supports those speeds as an "overclocking" option. You are overclocking the board to get that speed of ram.
If you plan on overclocking your CPU, just remember that the RAM at 1600 is already a motherboard overclock so to get your CPU to it's highest setting it's entirely possible you'll have to settle for a RAM speed less than it's "maximum".