Now that we know what performance we can expect with the CPU running at default speeds, it is time to push the envelope. The TbredB is unlocked by default on the Abit KR7A (KT266A chipset) motherboard, no need to paint any bridges, just change the multiplier in the BIOS, save your changes and reboot!
I dropped the multiplier and upped the Front side speed bus to 175Mhz to obtain "almost" default CPU speed:
I then experimented how high the CPU could go with only 1.66v of vcore. Once I found its limit I again adjusted FSB and multiplier to obtain this:
Hitting the limits of aircooling, the Alpha PAL8045 is no longer king of the hill and it starts to show, under load the temperature is almost reaching 45°C. So with 1.92v vcore I obtained the following stable speed:
Quite good overall!
~30% CPU speed increase at 1.66v and an impressive ~50% increase when using 1.92v!Temperatures
One thing that has always been very important when it comes to overclocking AMD CPU's, is keeping the maximum temperature under load low! Low on aircooling means <45°C. Anything above that and you will be faced with random reboots and lock-ups. If you drop the temperature using watercooling, peltier setups or phase-change cooling you can expect to see another rise in the maximum obtainable overclock!
Hell one person even managed to get to 2800Mhz with his XP1700+ Tbred B. He used a custom chilled watercooling to obtain these crazy results. But it shows you that anything is possible with the right equipment.