The Pentium II builds on the design of the Pentium Pro, but adds an additional 2 million transistors to bring the total up to 7.5 million. This measures how many signals can be generated per second. The higher the number, the faster the clock speed. Early PCs had MHz speeds around 8. Most often, however, you'll see the speeds in ranges between 166 MHz and 233 MHz.
Memory is measured in terms of megabytes or Mb.
Standard amounts of memory on today's PCs is usually between 16 Mb and 32 Mb. Often times, adding more memory can do more for the performance of your PC than upgrading the processor. So, if you had 8 Mb of memory in your PC right now, and you wanted to upgrade, you couldn't upgrade it to 9 Mb or 10 Mb, you would have to upgrade it to 12 Mb or 16 Mb. EDO DRAM is a good thing to have because it allows for blocks of memory to be copied from one location to another, instead of taking things in single bytes at a time. It's a high speed storage area that holds frequently used instructions, allowing your PC to respond faster.