The frequency of the FSB and the memory bus is specified in the FSB & Memory Config section.
Note that the FSB frequency is specified in an unusual quad pumped format. In ordinary terms, the FSB can be clocked at frequencies from 133 to 750MHz. The memory frequency is set up relative to the FSB (using FSB:DRAM divisors of 1:2, 5:8, 3:4 and 1:1) or pseudo-asynchronously. The nForce 650i SLI doesn’t have a truly asynchronous clock generator to clock the memory bus. When you select the desired value in BIOS Setup, the mainboard will pick up a most appropriate divisor (the chipset offers more than enough of them) and will report the actual memory frequency. In most cases this frequency is no less than 10-20MHz lower than the desired one. In the pseudo-asynchronous mode the memory frequency can be selected from a range of 400MHz to 2600MHz on the ASUS P5N-E SLI mainboard.
The CPU Configuration section allows choosing the CPU frequency multiplier (for CPUs that allow changing their multiplier) and provides access to various CPU-related technologies.
All memory-related settings can be found in the Memory Timings Settings subsection of the Chipset section.
As you can see, the mainboard gives you control over all the basic memory subsystem timings and over the Command Rate parameter.
By the way, almost all of the mentioned CPU and memory parameters and voltages can be set at Auto, which simplifies the configuration process.
Besides the overclocking-related options, the mainboard’s BIOS Setup offers a couple of extra features. First, it allows saving profiles with settings into flash memory or even in files. Second, it incorporates the EZ Flash 2 utility that allows updating BIOS without leaving BIOS Setup.
The program can take files with new BIOS versions from a floppy, a CD, a hard disk formatted in FAT, and from USB flash drives.
The mainboard’s hardware monitoring options are limited to showing three fan speeds and the temperatures of the CPU and mainboard.
The BIOS features the traditional Q-Fan technology that can vary the speed of the fans depending on temperatures.