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#1
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800 Mhz Frontside bus?
Hi there, do you actually get 800 MHz on the front side bus or are you limited
by the memory clock speed, i.e. DDR 400? Or is the 800 MHz only between the processor and the controllers (memory, north and south bridge)? Matt |
#2
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"Matias" wrote in message ... Hi there, do you actually get 800 MHz on the front side bus or are you limited by the memory clock speed, i.e. DDR 400? Or is the 800 MHz only between the processor and the controllers (memory, north and south bridge)? Some chipsets can run the CPU FSB at a different speed from the memory bus. This is often a big win if you have a chipset where the graphics memory is also main memory. DS |
#3
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In article , David Schwartz wrote:
"Matias" wrote in message ... Hi there, do you actually get 800 MHz on the front side bus or are you limited by the memory clock speed, i.e. DDR 400? Or is the 800 MHz only between the processor and the controllers (memory, north and south bridge)? Some chipsets can run the CPU FSB at a different speed from the memory bus. This is often a big win if you have a chipset where the graphics memory is also main memory. You also have to keep in mind that both that 800MHz and the 400MHz are somewhat misnomers. Both busses physically run at 200MHz. It's just that the bus to the CPU is "quad pumped"--that is it transmits 4 times per clock tick--and the memory bus is "double pumped". So, yes, they can run at their "different speeds" at the same time, becuase they're actually the same speed. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University |
#4
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System FSB is 200 MHz.
Double data rate (DDR) RAM runs at double the system's FSB, thus at 400MHz. The CPU runs Internally at four times the system's FSB, thus = 800 MHz. -- DaveW "Matias" wrote in message ... Hi there, do you actually get 800 MHz on the front side bus or are you limited by the memory clock speed, i.e. DDR 400? Or is the 800 MHz only between the processor and the controllers (memory, north and south bridge)? Matt |
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