Buying a hardware can be a very hard task if you’re not a techie,but you can use these tips that we provide for buying a machine that suits your needs .

Operating System
You can use linux , windows or apple os x but are also difficult to compare there’s really no need to compare all are stable and fast you’ll probably be satisfied with any ..

Video System
The video system sends the picture to the monitor. Many inexpensive computers use the main-system RAM to run video. The video processor is built into the motherboard (the main circuit board). This works, but is less desirable.

Better computers have a separate circuit board, called a video card. This includes the video processor and memory. For video cards, 64 MB of RAM is pretty standard. That’s more than enough for day-to-day computing.
However, if you are doing video work or playing advanced games, get a card with 128 MB of RAM. Truly hardcore game players can get cards with 256 MB of RAM.

Random Access Memory
you will need a minimum of 512 megabytes of memory If you can afford it get 1 giga , for demanding applications, such as video editing. Memory is relatively inexpensive, so don’t skimp.

Microprocessor
For Windows machines, you have a choice of the AMD Athlon XP, the Intel Pentium 4 and the Intel Celeron, an economy chip. The Pentium 4 and Athlon XP are upper end chips. The fastest Pentium 4 runs at 3.2 Gigahertz — a very fast speed indeed. It’s also very expensive. The comparable AMD chip, the 3200+, is slightly less expensive.
You may need these fire-breathers if you’re doing lots of video editing. Ditto if you’re working with computer-aided design or playing advanced games. Otherwise, look to chips running at 2.4 GHz to 2.6 GHz (or 2400+ to 2600+, in AMD-powered machines). They’re cheaper, and they perform nearly as well as the top-end chips.
Intel’s Celeron is a budget chip. If you do typical office duties and surf the web, you probably wouldn’t notice the difference between a top-end Celeron and a Pentium 4 running at the same speed. But you could save some money.
Apple and AMD chips run at lower speeds than those made by Intel. AMD uses the + symbol, as in 3200+, to imply that its chips are faster than comparable Intel microprocessors, despite running more slowly. Indeed, tests often show that to be the case.
Apple claims that its top-end machines are faster than those running Windows. That is a matter of controversy; there are websites devoted to debunking Apple’s claims. Apple’s chips run at much lower speeds, so they are difficult to compare directly. If you’re interested in an Apple computer, test one at a store, then test a Windows machine. Apple computers are more expensive than comparable Windows machines.
Both Apple and AMD have new 64-bit microprocessors. They can crunch twice as much data as 32-bit chips. But there are virtually no programs that take advantage of this power now. That will change in the future, but these expensive new chips don’t offer as much value today.

Hard Drives
If you do a lot of video work, you need a big hard drive. Video files are huge. Hard drives at 200 to 250 GB are common and relatively inexpensive.
Otherwise, the gargantuan drives common today far outstrip the customer’s needs. Even low-end machines today have 40 GB hard drives. You are unlikely to fill that. I recommend putting your extra money elsewhere.

DDR3 SDRAM (Double Data Rate Three Synchronous Dynamic Random Access Memory) is the third generation of DDR SDRAM Contains a lot of technical advantages compared to the previous units of memory,The voltage of DDR3 SDRAM DIMM’s was lowered from 1.8V to 1.5V , This reduces power consumption and heat generation, as well as enabling more dense memory configurations for higher capacities. while the speed is increased Clearly , from 800 MHz up to 1600 MHz. Technically the (DDR3) memory is very similar to the (DDR2) memory Both techniques Based on (Fine-pitch Ball Grid Array) Collecting chips system

Dual channel describes a technology that theoretically doubles data throughput from the memory to the memory controller.

Dual channel is the ability that some memory controllers have to expand the width of their data busses from 64 to 128 bits. Considering that everything remains the same (clock speed, ….), the memory maximum theoretical transfer rate is doubled by the use of this technique.

Think of it as a road intersection. The memory controller is the traffic light. In one direction you have a nice four lane road going through the light. One way goes to the CPU and the other goes around the board to where it is needed, such as the video card. There is another way to go, and that is to the memory. In single channel, this isn’t pretty. It’s a one lane street which needs to send information both directions. With dual channel it is a little bit easier. It could now be a two lane road, to send and receive at the same time.