They are two entirely different ways of connecting to RAM, so it's not possible to incorporate both methods without resorting to mobo Architecture like they had when mobo's had different slots for differnt style ram cards. BAck in the days of 386 / 486 / PI , everytime new memeory architecture came out the board lost space due to packing with slots of different sizes.
There are a few oddball mobo's that have 2 ddr slots and 2 ddr2 slots, but they are not worth the time or money...as the compromise offers little for future upgrades and decreases overall performance. DDR2 533/667 or 800 are available at lower prices these days and the performance difference between the 3 at stock values is small unless you are into overclocking, in fact ddr2 533 with nice tight 3-4-3-8 timings will offer just about the same performance as ddr2 800 with loose 5-5-5-15 timings.
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