Buying a powerful Power Supply

Since the PSU's or the Power Supply Units supply power to all of the components of the computer. It is extremely essential that one buys a PSU that provides enough power so as to provide enough power to the components that they do not slow down because of lack of power.
But buying a huge power supply does not mean buying a 2000 Watt SMPS. Doing that will take your electricity bill up to twice the normal. You need to buy a power supply that has a good amount of power while not having an excess of it.
Well, for starters you can be safe with a power supply of 300 Watts to the motherboard, a 20 Watt supply per drive, and a 20 Watt supply per 1 GB of RAM. That all works if you have a really low-end graphics card that doesn't require any more than 150 Watts to run and does not require any special connector to be powered.

• But in case your system has a high-end GPU, you'll have to add the required power of the GPU to  the above wattage and then buy the PSU. Also don't forget to check if the GPU requires an extra cable for power. If yes, add it to the required specifications for the PSU.
• Next, look for a power supply unit having a good amount of connectors of all types i.e. SATA, molex and PCI-E. Its always beneficial to buy one that has one or two connectors of SATA and molex for future expansions.
• And obviously, the PSU you are buying should have a large 60 mm fan, if not 120 mm one for excellent cooling performance for your system. My recommendation: Buy one with 120 mm fan even if it costs an additional $10.

How to choose the right cabinet for your desktop?

 The first and foremost important thing to consider before looking for a desktop case is that you know the form factor of your motherboard. If you know it, very well. However, if you don't know it, you should refer to the specifications of your motherboard or check it online. It is usually of the form ATX or micro ATX or BTX or micro BTX. This is important because the form factor decides the shape and size of the motherboard and we would obviously like to buy a cabinet, that can house our motherboard.

Secondly, it is a must that you buy a cabinet that has ample space inside. In simple words, buy a large cabinet. It promotes air flow and will keep your system cool. Thirdly, the case should not conduct electricity. Ensure that the case is not metallic and that each and every screw-hold for the components has rubber or plastic insides. This will help in preventing your system components from getting an electric shock.

Fourthly, there must be ample additional cooling fan attachment space in the cabinet. This is the first and the most critical point for gaming systems. Apart from the mandatory cooling fans present in your SMPS, over the CPU, and above the GPU, there should be provisions to attach more fans at the rear, the left side and in hardcore systems, the front as well.

Fifthly, see that the case has ample of hard drive and optical drive bays, so that you can attach as many HDD's and ODD's as you want. And optionally, look out for the optional components like headphone jacks, the number of USB connectors, etc. that help you in being more productive.

The image on the left shows a nice cabinet, with good cooling provisions.