Compaq Presario CQ62-235SA RAM Upgrade

The Notebook has 2GB DDR2 factory installed, I was give the laptop by elderly parent, no no books etc. So I downloaded the Service manual from HP (This seems to cover a variety of laptops) where it indicates it can support upto 8GB of DDR3 RAM. But elsewhere on HP website under the product and model specification it says it can only support up to 4GB of DDR2.....My question is whether I can replace all the RAM to 8GB DDR3 or even 8GB DDR2 RAM before I spend a lot of money on RAM I can't install....
 
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