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The DRAM speed rating that Intel provides represents the highest speed that Intel validates and warrants will work. All lower speeds are similarly warranted to work without issue. As well, this does not mean that higher speeds will not work; they could but Intel has simply chosen to not validate or warrant operation at these speeds.
Note: Whether a particular DRAM speed will work on a particular board is also dependent upon the design of that board and the quality of the components used on that board as well as the design of the DRAM DIMMs and the quality of the components used on those DIMMs.
Bottom line, the DIMMs you have should work just fine with the proposed processor.
Note: In order for a particular processor to be used, it must be socket, board and BIOS compatible. Before attempting substitution, consult the documentation for your board for processor compatibility information. If you cannot locate this information, consult your board manufacturer for this information.
Hope this helps,