laptop memory problem

My guess would be that the laptop only supports up to 1066 memory. Which when you use the old and the new together it reduces the speed to 1066 but when you use both new together, they both are at 1333.
 
I have 2 sticks of 800 mhz RAM in, but my laptop only supports 533 max. Could the problem be that one of the sticks is bad?
 
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