Im buying Q9550 and its FSB is 1333mhz. Now im interested in can i use 1600mhz memory or will it have somekind of negative effect on performance because it's higher then my fsb. Im not going to OC. Should i buy memory that is same speed with fsb or can i get faster memory? I would like to know can i get something of faster memory or does it cripple my system?
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It'll work fine assuming it's compatible with the mobo (it should be).
It may create a slight CPU bottleneck, but nothing noticeable. I wouldn't worry about it. As MrCommunistGen said, make sure it's compatible with your motherboard.