About CPU

This Desktop came with AMD Athlon x 2 5000+. Some other people ordered with other CPUs.

Installing the high End Athlon CPU on E521 is worth the upgrade.

CPU, as every computer users know, is the abbreviation of Central Processing Unit. It is the main calculator of all modern electronic machines. Every machine has the CPU(even that small calculator has it). People like to call it ''Brain'' but I wouldn't. It is the big powerful calculator and it calculates complex formulas all the time from when you turn on the computer.

The number of electronic cycle per second, ''Hz'' is the symbol used to specify how fast the chip operates. The bigger the number of cycle per second, the better the performance. Increasing the number of transistors with in the integrated circuit is generally the way to speed up the CPU. The symbol used to measure the space between the transistors are''nm'', the nanometre. Reducing the measurement between transistors are difficult but it speeds up the frequency of electric flaw while reducing overall temperature and the size of CPU plus less power.

Dual core CPUs were expected to perform 2 times better than the single core processors but no, the actual speed is about 50%-80%increase from my impression. Two cores within a single chip are given less power today and I think this is the reason why it is not working 200% better than a single core. Suppose you have 2 single core chips working together, I think they are much faster.

Dual cores are said it is capable to handle more applications at once but no, it doesn't(from my impression)yet.
Sadly, AMD quad cores are not so impressive either. The word '' Quad Core'' attracts a lot of customers but if you upgrade E521 with the highest Dual core Processor, you will not see a big difference at least not with your own physical eyes.

Benchmarks are practically useless unless there is a HUGE difference in performance. Please take it as mere entertainment and not seriously. Otherwise, you will fall into sales gimmick.