It looks like it would be upgradeable, however the website does not give power supply details. Generally these pre build systems come with the lowest wattage power supply the machine can use as to cut costs, which is good and bad. Dedicated graphics cards are very power hungry! IF you can tell us the wattage rating of the power supply once you've gotten the machine we can tell you what you need to do next. Best of luck!
Of course when I reread the page I find the power supply rating! It is only a 300watt power supply though so you'd have to upgrade the power supply if you wanted to get a new graphics card! Hope that helps you.
Okay. Thanks for the help. Are Intel HD Graphics 3rd generation good enough for the majority of graphics needs? I will be using the CPU more than the GPU, to be honest.