In the early days during the 1980s we can easily tell how fast a computer is based on its processor or central processing unit (cpu). A 33Mhz computer is faster than a 25Mhz and slower than a 66Mhz computer. It was easy to keep track because there would only be about 5 - 8 new cpu each year. Suddenly in the early 2000s, the cpu constantly getting faster with multiple cores on each processor. To make things more confusing the two biggest cpu manufacturers decided to stop calling their cpu by speed but with a code name like Pentium D 805 or AMD Phenom II 9550.
For the last two weeks I been looking to either upgrade one of my order computer or build a new computer. The cpu got different names and different cores. Is the AMD 6 Core cpu which cost $249, is 2 times better than the AMD 4 Core cpu which cost about $124? After doing some research I found a comparison benchmark chart that seems to be very good to show the difference between the speed and price. The chart is at located at PassMark.
Eventually I got the $249 cpu because the benchmark showed a big difference between the cpu for $100. If you don't need the speed for gaming, it might be worth saving the $100 then.