It has no impact on performance. Setting this to non-ECC can speed up systems with ECC cache slightly. Disable this for a speed boost on systems with ECC L2 cache. Many BIOS implementations contain an array of warning beeps to alert the user to problems. Award say that any other beep may indicate a RAM problem.
Computers emit electrical noise, which can be commonly heard as radio interference.
This setting modulates or varies the bus speed around the setting selected in the BIOS, ensuring that the computer does not emit radio interference at a continuous frequency. AGP cards work by dynamically allocating system memory to the video card. The GART transfers graphics data from system memory, to video memory. In actual fact the system memory can be fragmented, but the GART maps it as one contiguous block. If precharge is enabled the precharge will be performed immediately after a write access.