Macbook Pro level up to 8G RAM

I have call the official dealer of Apple for a upgrade of 8G ram,
and the answer is HK$3100.... @@

So, I decided to goto computer centre to find a suitable ram...
what I found is a 1333MHz 2x4G RAM, but my MBP is run at 1066MHz....
thought the diff in freq, I decided to make a try on it.

After I removed the 2x2G ram , and installed the new 2x4G ram, the MBP can boot up,
and running smooth without any problem..... :)
the 2x4G ram cost me about HK$590 only....... wow, a big save for $2xxx........