Does Changing the FSB speed increase the Video Card Speed too?

[Caveman]

Apples and Oranges or does changing the FSB speed from 133 to say 150 increase the operating speed of a video card at all?

 

[vss1980]

Well, if the video card has its own independant clock (as most do now) the graphics card will not overclock some more, but with the increase of bus speed naturally comes more bandwidth (as it would if you overclocked memory say).

So, running the AGP bus at 75MHz rather than 66MHz will give it a little more bandwidth which will allow faster transfer of texuters, T&L info, etc.

 

[Caveman]

I guess what I'm trying to ask is if changing the FSB is "dangerous"?... Because one might toast his Video card unknowingly (i.e. one thinks only his CPU has been overclocked and then clocks his video separately only to find ou the FSB increase has added to the Video Card Clock speed, thereby giving a higher video clock than anticipated)...???

Do you follow?

 

[sash1]

The only thing you really have to worry about is the PCI bus, so make sure your dividers are safe. The PCI bus is safe until around 38MHz.

Meanwhile, the AGP bus is safe up until 100MHz.

 

[vss1980]

Well, anything is possible.
But seriously, most graphics cards when they are being worked too hard will either give graphical errors or just crash the machine. It usually takes an amazingly stupid overclock to damage something.

As to whether or not overclocking the bus can have an adverse effect on the graphics card core and memory clock is a tricky question. Theoretically, if a device derives its own clock speeds from the AGP bus then it could do, but I haven't heard of any such problem.

 

[tazdevl]

Bottom line that no one has said is it depends on the devices some plug in. Some are more tolerant. If you read through the forums... some people have AGP cards that will not go out of spec... others that do. PCI... again, it's all luck of the draw.

 

[Rand]

<< The only thing you really have to worry about is the PCI bus, so make sure your dividers are safe. The PCI bus is safe until around 38MHz.

Meanwhile, the AGP bus is safe up until 100MHz. >>



I wouldnt quite say the AGP bus is 'safe" at 100MHz. Not as many cards make a 100MHz AGP bus as they once did, and there are still a very large number aof AGP video cards that wouldnt take to a AGP bus clocked in excess of 100MHz.