OCWorkbench has posted a review on the Iwill KK266R mainboard.

Of all the KT133A boards we have reviewed so far, all of them make it to at least 143MHz on the same Duron 600 Week 29 processor. While some make it to 150Mhz, this new kid on the block made the first successful race into the 160Mhz arena.

Iwill KK266R features 266MHz Front Side Bus (FSB) Athlons coupled with 3 Phase Power to support up to 1.5GHz processor speeds, and native dual channel Ultra ATA-100 support for 4 IDE devices with option to upgrade to a quad Ultra ATA-100 channels supporting up to 8 IDE devices (RAID version). There is also a 4 channel CMedia Audio sound on board.

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