bus speed question

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user63

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Jul 1, 2005
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When it comes to motherboard bus speeds, I believe, and correct me if I'm wrong, but here is how it works(for amd systems). The main clock frequency that you set is the FSB(CPU host clock), this is the base frequency from which all other frequencies on the mobo are derived. In my system its a setting called host/pci clock. There you can choose values that range from 133/33 through like 155/56. This means that the base frequency being applied to the fsb is 133 or 155 and after it double pumps its effective rate is like 266 to like 300. The other number tells what you set the pci bus to run at. Now, when you set the host frequency to 155, a different memory bios screen says the base frequency applied to the memory bus is 133, but when I run CPUZ it reports that the memory bus frequency is 155. This seems to be in conflict? Furthermore, if the memory bus is ruinning at 155, does this mean that it is doing 2 transactions per clock tick with an effective rate of 300MHZ just like the FSB? Basically it seems like you only can set the host/pci setting, and that the memory bus runs at the same frequency and effective rate as the FSB. Is this true. also bus speed seems to be the buzz word for effective rate and frequency seems to be the buzz word for base applied frequency
 
I'm under the impression that you are trying to dive into the world of overclocking your PC. While myself I DO NOT recommend to ANYBODY to overclock there PC I can point you into the right direction of where you can research how this works before attempting to change your PC's settings.

Changing these settings will have adverse effects on not only your CPU, but your MEMORY/HARD DRIVES/VIDEO...ETC... but then some boards are designed with the enthusiast in mind.

My last overclock was my sons PC, I got a 3200+ XP chip out of a 2500+ XP chip AMD CPU. And its still rock solid stable to this very day. But it helped to know which parts to buy, here are some resources for you

http://www.tomshardware.com , http://www.overclockers.com & http://www.anandtech.com/ .

Anandtech is my personal favorite.
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I am not trying to, or interested in overclocking. I just want to know if the DDR RAM I have is transferring data on the the leading and trailing edges of each clock pulse. Do I have to set anything to make this happen, and how do I confirm that its happening? The diagnostic program I am running(CPUZ) says the ratio FSB:Memory is 1:1, the FSB is running at 133.3, but the FSB's bus speed is 266.6 MHZ.
 
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