For the longest time, my best friend has been gaming on literally the worst computers such as a HP with an AMD E-300 SoC CPU. He has previously been running on my 7 year old Pentium Toshiba laptop. He wants to play games such as Diablo III, but is limited by the Intel onboard graphics. I finally decided to build him an actual gaming PC. The only problem was that both of us didn't have much money.
I ended up taking parts from old PCs I had lying around, and trading for other parts.
CPU/Cooler/Motherboard/RAM - All of these came from a supposedly 'dead' Dell Vostro 260s. I tried it with an old PSU I had lying around and it worked. I was pretty happy with this since most of my parts were Core 2 Duos and the like.
Storage - I ripped this from the HP I mentioned before. Didn't really have a spare drive lying around.
Case - I traded some parts to a friend for this steel behemoth. It's heavy!
PSU - The only new part in this build, aka the only part I paid money for. I ended up finding it on sale at Best Buy for $47.
Graphics Card - Another part I traded for. For a part that a friend found at a used parts store for $5, pretty good. I'm surprised at how relevant these old cards still are.
After I built the PC, the first thing I can say is that it's heavy! This thing's heavier than my own $2K gaming beast! It also plays games very well. Battlefield 4 runs very well.
Issues - The Praetorian isn't compatible with 2.5" drives so I ended up mounting the laptop drive on the side of the 5.25" bays. The GTX 285 gets REALLY HOT!!! like 50c idle hot. ramped the fan to 80% so it wouldn't melt. Runs about 37 - 40 idle now. For some stupid reason the motherboard can't find the CPU cooler so it gives an error at startup and the actual cooler sounds like a freakin jet engine running full tilt 24/7.
I'd say, pretty good gaming rig for $50. My friend is very happy that he finally has a computer that can actually run League of Legends at ultra high settings!