Hmmm, my first reply disappeared. Maybe because it was my first post here?
Note that graphics cards are often the most power hungry devices in a computer and according to the HD 4600 Series System Requirements
, that card requires a 400 Watt or greater power supply. It looks like you would need to call PC World to see what supply comes with that PB because I don't see the PSU specs listed.
As far as building your own, yes, initially it generally does cost a little more to build your own because Dell, HP, and the others can buy 100,000 hard drives, motherboards, cases, etc. at a time at discounted wholesale prices and individuals just don't have that purchasing power. Plus when you buy a pre-built, you have 1 phone number to call if anything goes wrong where if you build your own, you may have to deal with each device maker individually. With self built, you are Tech Support (with the help of forums like this, of course!). But the learning experience of building your own is huge, and when you build your, with careful planning, you can select parts that allow for easier and future upgrading. So over time, you can keep your system current with gradual upgrades rather than a full computer replacement and that helps level out the costs. When you build your own, you can make cost cutting compromises that fit your computing habits, not what some maker thinks fits your needs. Plus you can take pride in saying you built your own too. The downside might be the instant designation as the family or neighborhood computer expert and goto guy.