What does System Bus Speed tight-fisted when referring to CPUs?

I am looking to beef up my OLD computer for a while. I have a motherboard that supports Intel Pentium 4 (Socket 478) Processors. My current processor is a 1.5 GHz, 400 MHz System Bus.



While looking at possible replacements online, I see adjectives kinds of Pentium 4 (Socket 478) processors but they adjectives list different System Bus speeds. Some are 400 MHz, some 533 MHz, some 800 MHz.



My question are... What does the System Bus speed really mean? What is better? Can I put a 800 MHz chip contained by place of my current 400 MHz chip or am i limited to singular 400 MHz?

What does System Bus Speed tight-fisted when referring to CPUs?

The bus speed is basically how briskly the data is transferred across the board to other devices such as the video card, north bridge etc.



With Pentium 4 systems, you are mostly going to be restricted by the bus speed when you are trying to upgrade. Your motherboard will most likely not support any bus speeds faster than 400MHz.



But, in this day and age you can get some of the elder (older being a year or two) motherboards for to some extent cheap off of Ebay and other such places. Many of these boards will own support for the faster processors.
Your bus speed is the speed in which your processor can communicate next to the other components in your system. The bus speed is determined by your motherboard. The merely way to increase the bus speed is to replace the motherboard.
The system bus is the speed it communicates beside the RAM. The faster the better, but it all depends on your motherboard, it might not knob the faster bus speed.