For some reason, a lot of my colleagues at work and even some of my friends in their homes prefer to position their PCs on the floor, leaving only their monitors, keyboards and mice on their tables. Frankly, I don't think this is such a good idea. True, the jumble of cables coming from the rear of a PC isn't exactly aesthetically pleasing, but if one values reliability, durability and ease of use above aesthetics, it is always preferable to position a PC in an elevated position such as on a table, and not to leave it on the floor.
Reasons: Modern PCs have plenty of components which generate a lot of heat such as the CPU, the northbridge chip, power supply and video card among others. To keep these components cool, a PC typically has at least two fans, often more, and are configured to suck cool air from the front of the PC, through the chassis and out through the power supply and/or an exhaust fan at the rear. A PC on the floor tends to suck up the dirt, dust and grime on t...