Ok so I have checked and this is the current memory set up in my MBP: 4 GB of 1066 MHz DDR3 SDRAM (PC3-8500) installed in pairs (two 2 GB modules) When looking to purchase 8gb memory does it need to be 1066MHz and PC3-8500 DDR3 or can it be a higher than 1066MHz. Could someone give me a good selection to choose from as I am not to sure what to buy. I will be purchasing from the following website as I live in Ireland: www.dabs.ie I know it's a big ask but I would be really greatful if someone could recommend the best choice for my mid 2010 MBP 15" i7 duo laptop. One question will the increase of memory speed up my laptop of so what else will it add to my MBP. Many Thanks again.