I was interested in the Sony notebook you referenced, but like Dell's, the Sony site is so confusing. It's like Sony wants to obfuscate the products it sells from the consumer. I thought I had finally found the notebook you mentioned, but I don't think it was because the processor speed was different.
It made me realize that Apple does so many basic things right, like maintaing an easy-to-understand website, which its competition does not. You take these things Apple does well for granted because it seems obvious that all companies should do them well. But in contrast to Dell and Sony, when you go to Apple's site, you can clearly see which computers they sell. And they clearly explain the features.
When I tried customizing the graphics on a 13" Sony notebook this was the explanation of the upgraded video card:
Graphics Card
How do dedicated graphics effect PC performance?
Dedicated graphics (also called "GPU" or "video card") is critical for use with programs that have intense video graphics, which many of today's games and other media do. If your video card gets overloaded, your processor will borrow memory from your PC RAM which will result in slower reaction time, especially if your are running other applications. So, the more memory you have on your video card, the less your processor will have to borrow to display graphics, which will ultimately lead to better overall performance. Intel® Wireless Display technology available with Intel® Graphics Media Accelerator HD.
I bolded "effect" just to point out that, not only is the site a complete disaster in many big ways, but also some small ways, such as grammar. That paragraph just does not read well in general, e.g., "the more memory you have on your video card." A person doesn't have memory on his or her video card! A person's video card has memory!
At the end it has a phrase that isn't a sentence and references a Graphics Media Accelerator that you can't even choose as an option and is referenced nowhere else on the page. And Apple would never refer to one of the graphics options on their computers as being "overloaded."
I'm not a stickler for good grammar at all. I was just so unimpressed with the confusing layout of the site and poor presentation of the product. I think a lot of what Apple is lauded for having accomplished is their ability to present to the consumer something that is sensible and obvious. I'm not sure why that is so difficult for other companies to do.