The next consideration is the CPU, or processor. This is almost as important as RAM, so you should not skimp here either. The first thing to consider is a single or multiple processor solution. For most cinematic work, you will want to have a dual CPU system. Notice that we did not say more than dual-this is due to the way your 3D Program works with that components in your computer:
Your 3D Program performs nearly twice as fast when running a dual computer versus a single-processor model with respect to interactivity- that is, your interaction with the your 3D Program interface. Adding more than two CPUs does not benefit you as much in the interface and your 3D Program benefits from more than two of them in rendering speed.
Complex scenes using environmental effects and high-detail geometry exercise the processors more than a simpler scene does. So if you are going to be doing the modeling/animation and rendering on one computer, load up on CPUs. If you are going to be modeling on the computer and sending the rendering off to a rendering farm (a network of rendering only computers), two processors will be fine. Because speeds change so quickly, it is pointless to mention a specific speed to get.
The easiest thing to remember is that if you can afford the fastest, get it. 3D Acceleration there has been a ton of progression in the 3D acceleration market since NT has become more prominent in the 3D animation industry. PC users used to be restricted to fast 2D acceleration video cards. It was not until about 1993 that 3D acceleration manufacturers began to produce for the PC. Since then, many technologies have come. In fact, some are already gone. When you are modeling for cinematics or anything high-resolution, a 3D acceleration card is a must.
The primary reason for this is that an accelerator card can relieve the processor somewhat from having to make the calculations to display geometry in the viewports. If the CPU has to worry less about what to display and more about what to do with the geometry, you will be working much more efficiently. The key to accelerators is that they take some or all of these processing tasks to their own processor and free it up for working on other tasks. The more they are designed to take on, the faster the display will be.
Source by Daniel Kreimer