Macbook (White 2010) works with 5GB of RAM but not 8GB

I bought 2 x 4gb modules the other day. I tried to install them both on my macbook which although supposedly supports 4 gb of ram but others have proven it will support up to 8gb. I installed them then booted up my Mac but it would not start it merely kept beeping.
However when i used one of the modules with one of the previous modules i.e 5gb in total, my computer turned on and is working. Why don't both of the modules work together? How come I am unable to get 8gb of RAM but I am able to get 5gb? Both modules work when i use them with a 1gb module, but they don't work together. Any Advice?

Yeah the 4gb is being recognised, my mac is running off the 5 gb in total. True, but i've seen videos where people have the exact same mac as me and have 8gb RAM. But yeah thanks for your help guys

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