Most of these parts have been either salvaged, or bought refurbished online, which brought the cost down to about $300. The system runs with a three-monitor configuration, and is used for things like programming, surfing the net, some 3D gaming, and video editing.
I had a few problems getting this setup to work. Firstly, the motherboard can only control the speed of two fans via PWM, even though it has three sockets for fans. The Deepcool CPU cooler that I bought actually came with two fans, so I ended up with four fans in total on this system. I managed to control the CPU cooler using a cable splitter.
I tried to minimize the cost by first using a scrap power supply I had laying around. Well it turned out that it couldn't keep a stable voltage, which resulted in a lot of noise from the CPU power filters. I bought a new power supply, and that reduced the noise.
If there was one thing that I would change, it would be the video card. While I did get the card refurbished at a very good discount from eBay($50), I wished I saved up a bit more, so I got right into the video card "sweet-spot" The FurMark test is about 16FPS on the 720p preset. Quite low, which is why another graphics card would be awesome.
I can play Dead Space, BF2, BF3, BF4, LFD2, and Fallout 3+4 at around 40FPS at medium settings on one monitor. If I want to play on all three monitors, I have to lower the graphics to low or very low usually in order to achieve 30FPS. BTW, the GeForce 740 does not come with Nvidia's multi-monitor software, but third-party utilities like SoftTH usually work well.
Oh and also, overclocking was a pain for any of the components. The graphics card OC was unstable, and the BIOS simply refused to overclock. Never got OC working.
Check out some more of my projects at denialmedia.ca.