It's not on-board, noobs. It's integrated with the CPU. On-board describes something that is literally on the motherboard. Damn old people can't keep up with the their tech mumbo jumbo these days.
While a dedicated GPU might be better this isn't shitty Intel integrated graphics we're talking about. When they say 7660 they actually mean it. The only thing you have to keep an eye out on is the speed of the RAM but Gravy has went for 1866 which is pretty damn fast.
I'm sure Haswell's new integrated is more competitive but AMD are doing things right as far as integrated is concerned.
My wife's $400 A6-4400M powered laptop puts up some decent fps on low-res gaming. Their APUs are damn fine budget rigs! Intel has literally 50x the amount of money as AMD has at their disposal, but the competition for cheap computing is definitely in the underdog's court.
The Psu will have more cables than you need as some people have multiple HDD's or GPU's and loadsof case fans. You do not need to buy a disk drive. To get started all you need is the lan driver from AMD's website. Copy it from another computer and transfer the file to yours then run the .exe. Once you have that you can go to AMD's site and download the drivers that are on the disk ie,usb,chipset,sata being the other 3important ones.
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Sorry forgot to say you will need to enter the model of your mobo/apu to get the correct drivers so they are compatable on your set-up.