Hi everyone, thanks in advance for the help here. My MBP is a 2010 model 15' model. Processor: 2.4 GHz Intel Core i5 Memory 4GB 1067 MHz DDR3 Recently I realise that my MBP is running really slow so I have decided to upgrade the ram. I have search the forum and someone recommend to purchase the ram at www.crucial.com I have search on that website and there are 2 8gb option - the only difference is one with 1.5V and the other one with 1.35V. Can someone explain to me which one is better for me please? I am happy with the price on crucial.com but if someone has a better option then feel free to recommend it to me. Also, is 8GB the highest ram that I can upgrade to? Thank you once again.