Macbook pro early 2011 RAM upgrade

One of my friend has Macbook pro early 2011 specs
i5 2415m
2x2GB DDR3
320GB HDD

Apple officially supports 8GB RAM and intel website also shows that max RAM supported by i5 2415 is 8GB.

But, some people have mentioned that it is capable of supporting upto 8GB
*discussions.apple.com/thread/3588294?start=0&tstart=0