Overclocking: AMD Puts A Clamp On The Multiplier?
In the routine overclocking tests, we noticed that the multiplier of the Duron 1300 was locked. Even after bridging the L1 contacts, we still weren't able to release the multiplier. We investigated the Duron 1300 together with many of the latest motherboards with the VIA KT266A chipset as well as the SiS 735 chipset. However, the results were always the same: adjusting the multiplier to below 13.0 hampered the bootup process, while CPU settings of 14.0 or 15.0 (pseudo-multipliers) were promptly ignored. In any case, we couldn't tell if this had to do with a hand-picked CPU, or if AMD has begun using a multiplier lock starting with the Duron 1300. So the only way to overclock was to increase the FSB clock speed. In the test, the AMD Duron 1300 ran stably at a maximum of 1438 MHz, using traditional air-cooling.
1438 MHz is the limit: the Duron 1300 runs stably all the way up to this clock speed.