The fact is, that AGP x 4 requires extremely tight timing settings and alteration of the bus clock will simply exceed these settings and cause malfunctions. In other words, AGP x 4 and overclocking appear to be counterintuitive if not mutually exclusive. The second important BIOS change concerns the memory clock. This means also that, if the FSB is raised for overclocking, the DIMM clock is raised accordingly. The most important addition to the BIOS concerns the CPU IOQ size, which can be set as either 1 level or 4 level.
IOQ size refers to the depth of the pipeline used for writing to the system memory.
A 4 level IOQ supposedly dramatically improves the performance whereas the 1 level IOQ is more or less the equivalent to a fail safe setting. By extension, one can postulate that the stability at the 4 level setting is compromised. Again, stability very often depends on the quality of other system components such as memory, CPU and video card. In our hands, we did not notice any difference in stability between the two settings, with the correct memory settings the Trinity 400 was sitting there stable as a rock. Anyone used to the established overclocking capability of the Celeron is in for a huge disappointment.