It's been some time since I started looking for a definitive answer for this question. Finally, I arrived to this forum, where I hope there will be someone who is knowledgeable enough to explain this to me.
Supposedly, FSB is the speed at which the CPU interacts with the memory and the PCI/AGP buses.
FSB is always much lower than the CPU freq.
Up to now, I had always thought that you could set any FSB, and the only limits were the speed of the RAM and the ability of the mobo to set the correct divider for the PCI/AGP buses. This has been the case with PIIs and PIII, as far as I know.
That is to say, if my mobo sets the correct dividers for the buses, and my ram is DDR400, I should be able to set the FSB to 200MHz no matter what CPU I have.
Suppose I have a 2400+ (stock FSB 266MHz, stock freq 2.0GHz). I should be able to set it to 200x10, because if the CPU can manage 2.0GHz, it sure can manage a 200MHz FSB.
But further investigation showed me that a 2400+ may have trouble reaching 200MHz FSB. Many people say that their 2400+ can't reach that speed. I myself am having trouble with my 2400+ and Kingston DDR400, on an A7N8X 2.0.
At first I suspected the RAM, because I couldn't make it work stable at more than 185. But know I'm having second thoughts. I have the RMA to send the RAM back to Kingston, but I guess I'd rather ask here first.
IS IT TRUE THAT THE CPU (AND NOT ONLY THE MEMORY) CAN LIMIT THE MAXIMUM FSB?
IS IT TRUE THAT MAYBE I'M STUCK WITH HAVING TO RUN MY DDR400 RAM AT 185?
I could phrase these questions in many ways, but I hope you will get my point and you will tell me everything you know that can shed some light on this, even if I haven't asked directly about it.
THANK YOU ALL FOR YOUR PATIENCE.
Supposedly, FSB is the speed at which the CPU interacts with the memory and the PCI/AGP buses.
FSB is always much lower than the CPU freq.
Up to now, I had always thought that you could set any FSB, and the only limits were the speed of the RAM and the ability of the mobo to set the correct divider for the PCI/AGP buses. This has been the case with PIIs and PIII, as far as I know.
That is to say, if my mobo sets the correct dividers for the buses, and my ram is DDR400, I should be able to set the FSB to 200MHz no matter what CPU I have.
Suppose I have a 2400+ (stock FSB 266MHz, stock freq 2.0GHz). I should be able to set it to 200x10, because if the CPU can manage 2.0GHz, it sure can manage a 200MHz FSB.
But further investigation showed me that a 2400+ may have trouble reaching 200MHz FSB. Many people say that their 2400+ can't reach that speed. I myself am having trouble with my 2400+ and Kingston DDR400, on an A7N8X 2.0.
At first I suspected the RAM, because I couldn't make it work stable at more than 185. But know I'm having second thoughts. I have the RMA to send the RAM back to Kingston, but I guess I'd rather ask here first.
IS IT TRUE THAT THE CPU (AND NOT ONLY THE MEMORY) CAN LIMIT THE MAXIMUM FSB?
IS IT TRUE THAT MAYBE I'M STUCK WITH HAVING TO RUN MY DDR400 RAM AT 185?
I could phrase these questions in many ways, but I hope you will get my point and you will tell me everything you know that can shed some light on this, even if I haven't asked directly about it.
THANK YOU ALL FOR YOUR PATIENCE.
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