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Mick
 Nov 24, 05 - 4:20 PM |
Bus & Clock Speeds
Hi There, I hope someone can help me, I am an I.T student but i'm having a bit trouble working out bus/clock speeds.  I understand that the FSB is the curcuit around the MOBO that connects all major componant such as the CPU,memory,chipset and and agp socket. What i cant seem to work out is the equation that makes up your clock speed!! Any help would be greatly appreciated. Mick. |
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V. Subhash
Nov 29th, 2005 - 1:00 AM |
Re: Bus & Clock Speeds
FSB is the connection between the CPU and the North Bridge of the chipset on the motherboard. The Northbridge is the part of the chipset (motherboard electronic intelligence) which interacts with the RAM and the graphics subsystem. The speed of the FSB is set by the speed supported by the RAM. There is something called bus multiplier. This is a setting on the motherboard. The number of the bus multiplier multiplied with the speed of the RAM equals the process speed. CPU speed = RAM speed x bus multiple Example: A 1600 MHz CPU with support for 400 MHz RAM 400 (ram speed = fsb) x 4 (bus multiple) = 1600 MHz If you use 333 MHz RAM with this CPU, it will work fine but will underclock itself. 333 x 4 = 1333 MHz. An overclocker will want to increase the speed of his PC by increasing the FSB speed from the BIOS. 420 x 4 = 1680 Usually, the bus multiple is locked by the CPU manufacturer. With AMD motherboards, FSB is eliminated by integrating the memory controller in the processor die eliminating that job for the North Bridge. See diagram in the PC Hardware Explained article. So, FSB is no longer relevant. The HyperTransport is much faster than FSB technology. Intel still uses FSB-based MB architecture. |
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Mick
Jan 23rd, 2006 - 4:22 PM |
Re: Bus & Clock Speeds
Thank you for your explanation it was most helpful. |
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