BIOS and nTune support
Thus far, nothing disqualifies the NF4UK8AA from being a capable enthusiast board, but the BIOS is the hardest thing to get right.

Things start off well enough. In the overclocking department, the board's BIOS offers HyperTransport link speeds between 200 and 300MHz and PCI Express bus speeds between 100 and 145MHz, both in 1MHz increments. HyperTransport, chipset, memory, and CPU voltage tweaking options are also available, with CPU voltage options as high as 1.8V.

Sadly, the NF4UK8AA's BIOS lacks what is perhaps the most important ingredient for Athlon 64 overclocking: CPU multiplier control. Support for Cool'n'Quiet clock throttling effectively unlocks lower Athlon 64 processor multipliers, giving users the ability to crank the memory bus without running the processor too far out of spec. However, while the NF4UK8AA works with Cool'n'Quiet, its BIOS doesn't give users arbitrary control over the CPU multiplier.

To be fair, one can also manipulate the Athlon 64's processor multiplier with programs like ClockGen. Third-party software doesn't make the NF4UK8AA's BIOS any more complete, though.

Missing CPU multiplier aside, the NF4UK8AA BIOS's memory and HyperTransport tweaking options are pretty good. All the key memory timings are there, and HT multipliers are available between 1x and 5x to keep the HT link running in spec with an overclocked processor or memory.

Foxconn also sneaks a CPU shutdown temperature into the BIOS, which is a handy little safety feature. Temperature-controlled fans would also be handy, not only for enthusiasts, but also for mainstream users who simply desire a quieter system. Unfortunately, none of the NF4UK8AA's three fan headers offers temperature-based fan speed control.

If you're a little shy about poking around in the BIOS, Foxconn bundles the NF4UK8AA with a software suite that allows you to play around with various BIOS tweaking, monitoring, and even overclocking options from Windows. Foxconn's "SuperStep" software actually offers some useful hardware monitoring capabilities, but the interface is clunky at best. Fortunately, the NF4UK8AA also supports NVIDIA's nTune system monitoring and tweaking software, which is a much slicker application.

nTune can monitor many of the NF4UK8AA's system variables, including CPU and system temperatures and voltages.

Users can also tap nTune to tweak the NF4UK8AA's HyperTransport link speed and multiplier, PCI Express bus speed, and memory timings. nTune doesn't seem to report the board's PCI Express bus speed properly, though. nTune would also be a handy place to offer CPU multiplier control, if only the NF4UK8AA's BIOS supported it.