I'm sorry I don't know exactly what forum this would be best to put this under, but I thought this would be the best. My question is what is the difference between the i3, i5, and i7 processor. Also what kind of AMD processor is comparable to these, and what speeds. Can you also explain the difference between the the dual core and the quad core, I know one is 2 cores and one is 4, but I mean in terms of processing. Thanks for all your help! Also can you explain how much difference is between the AMD Radeon HD 6490M with 256MB GDDR5 memory and the AMD Radeon HD 6750M with 1GB GDDR5 memory sorry about all the questions, but i want to be well informed, because im looking at every angle for a new computer.