Doubt if it would be a chipset for a 32 bit AMD CPU. Can't be for the 64 Bit AMD, because they have the MCH on the CPU die itself and thus have locked themselves out of DDR2 until they redesign the CPU.
Intel had a 1066 MHz FSB months ago, so the next step seems feasible.
Just looked at it. Obviously an Intel chipset. Note that it does not say that the Mushkin memory actually is running at 667. They nicely fail to mention the FSB. Probably is the Intel 925XE chipset which supports the 1066 FSB. So it's got a top line memory which overclockers may be able to use to run the system at a higher overall performance. They do this by reducing the multiplier [it's top locked, but can be lowered], then they overclock the memory, adjust voltages et al to get more performance. Obviously then, this piece of memory can be overclocked well above the standard memory used for the 1066 MHz FSB.