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Can I install DDR3 1333 RAM into a notebook that is currently running DDR3 1066 and will it have any effect on performance?

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Depends on the motherboard , check your motherboard model and see if it can support ddr3 1333 RAM – Shekhar Apr 21 '11 at 17:24
use cpuz to check your motherboard model – Shekhar Apr 21 '11 at 17:26
up vote 4 down vote accepted

If the memory is otherwise identical, it will work fine at the lower speed. The clock speed specified for a memory module is the MAXIMUM speed that it will work at. There is no harm in using in a system configured to go slower.

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lookup the manual on your notebook, it should mention all the different speeds of ram the motherboard supports.

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