by mistake I have bought, http://www.ebay.co.uk/itm/200787930158?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1 497.l2649 which is 2.4ghz ram for my early 2011 macbook pro which has only 2.3ghz will it still work in my macbook even though they are different ghz's. I emailed the compant for this instead, http://www.ebay.co.uk/itm/8GB-RAM-Memory-for-Apple-MacBook-Pro-2-3GHz-Intel-Core -i5-13-inch-DDR3-Ea-/200787930264?pt=UK_Computing_ComputerComponents_MemoryRAM_J N&hash=item2ebfe4ac98 but then noticed that this just 1 moduel of 8gb ram and not 2 lots for 4gb ram. Will 2 different sticks of ram work like one of my current 2gb + 8gb=10gb. I am new to upgrading thats all thank you. Do the macbook and ram GHZ's have to match up?