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 Overclocking the Celeron 466 PPGA:
HEAT: your worst enemy
By: Sverre Sjøthun, November 11, 1999  Print this article


Heat is your worst enemy when overclocking. If you don’t have proper cooling, you will not achieve wanted speed, and the long-term damages may result in malfunctional CPU. This is what’s called "electromigration". What actually happens with your CPU is that the PN-junctions/metal lines in the transistors form hillocks or short-circuit. With the downscaling of electronic devices this fact has become more and more important for the reliability of microelectronic components.

(FESEM micrograph of aluminum lines exhibiting classic electromigration voiding).

There are, however, a few tricks to prevent this. Buy the biggest, nastiest heatsink-combo available, and this combined with a TEC or two will cool your CPU to sub-zero temperatures, depending of how powerful the TEC’s are. What the TEC really does is absorbing heat on one side, while rejecting it on the other side. TEC is short for "Thermo Electric Cooler" (I assume, because this makes sense. Never seen it written anywhere though.), and that’s exactly what it is.

ABIT BP6, first impression.
When I opened the box, everything was just as it was supposed to be. Neat and tidy. Big plus is the UDMA66-cable that follows.

After assembling the computer, it’s time for a test-drive. Once more, everything is just as it’s supposed to be. When I finished the installation of the UDMA66-drivers, I restarted the machine. In the SoftMenu II, I upped the FSB to 75, just to see how this worked out. The machine POSTED and starting Win98 wasn’t any problem. Next step is 82MHz, POSTED just fine, and still no problems in Win98. Now, remember I’m still running it with retail heatsink-combo and the core-voltage is 2,0V. Upping the FSB to 85MHz also went just fine, but it wouldn’t go any further than that.

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