What is a good laptop or notebook for graphic design?

There are lots of laptops available on the market. Different company launches different types of laptops and net books, but as you said that you need to buy a very good laptop which supports good graphics and give you a better performance, so I want to tell you that for that purpose you will need a very high configuration laptop, which contains at least 4 GB of RAM and 500 GB of hard drive and also support a good graphics card, so I want to tell you that Lenovo comes with their G series laptops, which come with 4 GB of Ram and 500 GB hard discs and also contains nVedia graphics card of 1 GB, Sony Vaio also comes with the same configuration with their Vaio series laptop the difference between Sony Vaio and Lenovo laptop is only for hard drive Sony comes with 320 GB hard drive and Lenovo comes with 500 GB rest of the features is same, so now it’s your turn to choose the better or as per your standard.