How much ram can i upgrade my 2009 MacBook Pro running 2.26ghz

i currently upgrade my MacBook Pro mid 2009 with 2x 4GHZ 1066 mhz ddr3 and keeps on quitting while I'm using it. why?

What brand of RAM did you purchase?
Have you taken out the modules , cleaned the contacts and reinstalled them?
Have you tried the original RAM?
Have you run an Apple hardware Test?
http://support.apple.com/en-us/HT201257
Note an error free AHT is not definitive.
Ciao.

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  • How much ram can my iMac take?

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