Here's how we see the success rate shaping out for each of the speeds above, when using a proper cooling device:

Combo			Speed	Success Rate
6.0 x 66MHz	=	400MHz	100%
6.0 x 75MHz	=	450MHz	100%
6.0 x 83MHz	=	498MHz	90%
6.0 x 100MHz	=	600MHz	15%
6.0 x 103MHz	=	618MHz*	10%
6.0 x 112MHz	=	672MHz*	.1%*
6.0 x 124MHz	=	744MHz*	.0001%*
6.0 x 133MHz	=	798MHz*	.0000001*

*Supercooling required

As you can see from the chart above, the 6.0x multiplier is tough to overcome. It sends MHz levels shooting into the stratosphere too quickly, and forces jumps of nearly 75MHz between settings. One positive note lies in the 6.0 x 83MHz selection, as 500MHz for $170 is a pretty fair bargain. In fact, even our in-house P2-450 CPUs can only overclock to 504MHz (4.5 x 112) thanks to their handicapped 4.5ns L2 cache, so when the Celeron(tm) 400 CPU is evaluated by gamers for purchase, it seems clear that it brings a lot to the table.

We tested our two boxed retail Celeron(tm) 400s at each of the settings above, and utilized one of the finest Celeron(tm) fan/heatsinks available, the Glacier 4500C. The 4500C comes equipped with a nearly P2 sized heatsink, with three fans staggered on the top of the piece. It also comes with thermal grease, which is a must for this type of testing.