Upgraded my ram/memory to 8gb now having problems

I installed 8GB of Ram into my Aluminum Macbook Late 2008 model and just now read that the maximum allowed is 4GB. My computer works fine most of the time but sometimes it freezes up. But then when I googled it I'm getting mixed responses saying that I can install 8GB as long as its the right one for the system. Any advise? Am I frying my system? It works fine but like I said sometimes it freezes up and it wasn't doing this before.
Thanks
<Personal Information Edited by Host>

You are fine. 8 GBs is the maximum you can install.
Maximum Memory
8.0 GB (Actual) 4.0 GB (Apple)
Memory Slots
2 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM

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