POWER SUPPLY
Before purchasing a power supply, it's a good idea to draw up a general power budget for a PC. You can do this by adding up the total energy draw from each of your system's components. CPUs typically fall in a range of 35 to 130 watts, the motherboard from 25-50 watts sans RAM, drives usually fall between 15-20 Watts apiece, and graphics cards may require anywhere from 30 to 200 watts depending on the specific make and model in use. Add 30 percent to this total when you're finished just to be on the safe side. If you want to make room for future components or upgrades, bump this fudge factor even higher, but don't forget that power supplies tend to be somewhat less efficient as loads increase.
Heavy-duty power supplies get expensive pretty quickly, and in view of quad core CPUs that will impose widely different power draws depending on their energy saving regimes (a la SpeedStep and Cool'n'Quiet) switching individual cores on and off, I only recommend extreme models when they are really necessary.
The big impetus for power supply makers going forward should not be to build ever-bigger and -beefier units, but rather to keep improving efficiency ratings.
The big impetus for power supply makers going forward should not be to build ever-bigger and -beefier units, but rather to keep improving efficiency ratings.
To be sure, power supplies rated at 600 watts and up have legitimate uses, but the total population of users who need that much power is miniscule comparison to the legions of average users. With a little knowledge and some considered calculations, savvy buyers can save money on both power supply purchase and operating costs.
CASE
Concerning cases, it's advisable to chose a wide case in order to our system can "breathe". This extra space also will let you upgrade your system with new cards or drives, such as a new Hard Drive, a TV card etc.
t's also a good idea to buy a case with several fans. We will have always the processor fan and the fan of the power supply. However I think that is necessary at least one or two more fans to extract better the heat generated inside. Besides, the case should have little holes which let the hot air go out of the case.
Finally, I find quite useful to have good access to USB ports. For example, I would choose a case with at least two USB ports in the front side.
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