Posted 18 May 2012 - 08:36 PM
Be sure to buy a good quality PSU, and make sure it has more than enough power to run the components.
Buy the best quality mobo you can afford - Gigabyte and Asus are two of the best makes on the market.
Also, go for top quality RAM that is matched to your mobo, and suitable for your Operating System.
The graphics card is a key component in a gaming machine, so before you buy I suggest you do some research on the net re a suitable card for the games you intend to play, and check out compatibility between the card and the chipset in the mobo.
If you put the make and model of the card into google, you will soon find info re any problems with the card, such as driver clashes, tendency to overheat, etc.
Personally, I would go for one of the latest low voltage Intel i5 or i7 processors that tend to run cooler under pressure.
If you are in the UK, I highly recommend dabs.com – they have very keen prices, and I have found their after-sales service to be excellent.
Assembling a desktop PC is as easy as putting lego together, and usually takes about an hour without rushing. A simple but useful tip is to have a small but long shaft Phillips screwdriver to hand, with a small ball of bluetack to hold the screws on the tip - makes life a lot easier when placing small fiddly screws into awkward places ;-)
The most important task is making sure that all of the components are compatible, and that they are set up properly, jumpers, etc - details of which you should find in the mobo manual.
If you want to see how its done, take a look on You Tube – the basics of assembly are pretty much the same from one desktop to another.
I doubt that you will save much on cost by building your own, but it does mean that you can build to your own specifications and requirements, and you can be sure of the quality of the components, e.g. a lot of off-the shelf desktops have cheap and nasty PSUs in them, even some of the top brands.