So what exactly is the difference between an i5 and an i7? Is that the number of cores or just the model number?
Both the i5 and the i7 are quad-core processors. However, the only differences between the two are stated very well in
this article.
And how does RAM relate to the processor?
The more RAM you have, the more information can be processed at a time. In terms of Blockland, more RAM = more bricks. 8GB of RAM with an i7 processor would work beautifully, while 4GB with an i7 would be limiting of the processor. All this is, of course, assuming your operating system can utilize all the RAM. For instance, my 64-bit Windows 7 can utilize all of my 4GB of RAM. 64-bit operating systems can use more RAM than 32-bit ones.