Gigabyte GA-6BX Motherboard
This motherboard uses a LinFinity regulator on the 3.3-V rail that is rated to
only 5 A—less than the AGP specification, which requires 6 A. When
diagnostics or applications are running, the temperature of the regulator rises,
causing the voltage to the NVIDIA chip to drop as low as 2.2 V. Under these
circumstances, the regulator cannot supply the current on the 3.3-V rail that the
NVIDIA chip requires.
This problem does not occur when the graphics board has a switching regulator
or when an external power supply is connected to the 3.3-V rail.