Durons below 1ghz were Spitfires while the faster ones up to 1.3ghz were morgans and the 1.4-1.8 ones applebreds. bios update may be needed to accomodate newer duron. multiplier restrictions may apply if you install a faster athlonxp. note that durons are ddr200 and only thunderbird athlons used this bus, the last model being a 1.300 or 1.400 ghz. take care there were double models of the same frequency with different bus (fsb200/fsb266). if the memory type is sdram pc133 the cpu is probably a spitfire.
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