SiS740 chipset - you are limited to a 266 MHz FSB processor.
The version of the XP 2600+ that you want is very hard to find nowadays. Your best bet would be an XP 2400+. You can use a Mobile processor (which uses a 266 MHz FSB), but, it does require your board to have the ability to change multiplier's. There is a way to do it in Windows, but I don't think you want to do that sort of configuring. http://www.syntaxgroups.com/index.php
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