ASUS P4S533 SiS645DX (1)
Overclocker 10 April 2002

This is the first retail board based on the SiS645DX that we review. If you have read our previous review of the reference board, you would be surprised that the power of Pentium 4 is unleased and brought to another level that was never possible with DDR.

SiS645DX is the new generation of the SiS645. SIS645DX supports the official 533Mhz standard e.g. those P4 that runs 133Mhz (533) FSB. Secondly, the improved 961B south bridge now supports ATA-133 standard. While lots of people thought DDR333 means running the CPU at 166/166 (333/333), that is not true as it is considered overclocking. In fact, it should be async 133/166 (266/333). To our surprise, SiS645DX has something even better which we discovered in the BIOS. The BIOS allows us to run the board at Async DDR400 mode. That means running the DDR module at 400Mhz (not 266, not 333)! Although P4 533Mhz CPUs are not available at this moment, we can always use a P4 ES by lowering the multiplier. In our tests, we lower the P4 1.5G's multiplier to 11x and raise the FSB to 133Mhz. 

Before we look at the benchmarks, here are some photos followed by specifications on the next page.

We have more photos on the next few pages.

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