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Well you can't put in the sdram, it's not compatible.
DDR is double data, sd is single data, hence ddr is twice as fast as sdram. faster ram is required because the cpu would be much faster than the cpu you were using sdram for - it executes instructions faster, so needs to be able to read and write to memory faster, otherwise it won't be working to it's full potential if you were to use slower ram.
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