I can not find any reliable technical info on the Q9800. The only mentioning of a Q9800 is by retailers on ebay. I'm not saying that it doesn't exist, but without any hard information I would be leary about buying a system with one in it (especially clocked at 4.7GHZ and for that price). The crossfire 4850s would be nice and somewhat impressive, but they are out of date at this point. So IMO, no, for the money this is not a good buy. If it was half as much then maybe, but not at £825 (approximately $1400 USD). You can do better if you shop around or build a system yourself. You could probably order the parts you want and pay someone to build the machine for you for less than this one that you list.