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Front Side Bus Frequency;
is the maximum speed that the Data Lines from the CPU can be clocked.
The actual FSB frequency you can run depends on your CPU, motherboard, and RAM.
Some CPUs, such as AMD Athlon's double clock. That is the CPU bus clock is actually 2* the Data bus clock.

Multiplier:
This is the diference between the CPU maximum clock frequency, and the FSB frequency.
CPU clock / FSB = Multiplier

ECC RAM has built in error correction.
Your system does not run faster with ECC, it is just more fault tollerent.
ECC RAM is usually only used on "critical" applications as the cost is much higher than "normal" RAM.

The Motherboard must support ECC, and ALL RAM modules must be ECC to enable ECC functions.

Overclocking is running the CPU at a clock frequency higher than the rated frequency.

While overclocking will get you higher scores on benchmark tests, for the average user, there is NO benefit from overclocking.
On equal systems, doubleing the CPU clock speed will result in at best a 25% increase in perfromance.

Also, overclocking reduces both CPU and system life and stability.

Chas

I'll answer 5 of the 5. Overclocking is increasing the speed at which the central processing unit [CPU] or graphicical processing unit[GPU] operates This was usually done by computer gamers to increase the ability of their computer to process graphic frames and to increase the video card's ability to process graphic frames at high resolutions. (1024X768 and above). Because of the advancement of processors (the intel 2+ Ghz processors and the AMD 1.6+ Ghz processors) overclocking of the CPU isn't really done anymore. It really isn't necessary. Now they overclock the Graphics card processor. Any tweeking of the hardware over and above what the manufacturer sets voids the warranty.

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