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can i use 667mhz in place of 333mhz on my laptop
no Look up you model @ http://www.crucial.com/
The assumption is that the 333MHz RAM you have is DDR type and the 667 you're considering is DDR2. Both need to be SO-DIMM also. DDR2 is not compatible with DDR. You need to locate either 333 or 400MHz DDR SO-DIMM if you have 333 DDR now.
333 is DDR. 667 is DDR2.