On Wed, Oct 27, 1999 at 03:54:36AM +0000, Kyle Davenport wrote:
> Greg Youngblood wrote:
> > I believe the memory bus has the ability to run up to 200 MHz FSB, just like
> > the Alphas. However, if you load it with 100mhz memory, it will run at 100
> > mhz. If you use PC-133 memory, you'll need to make sure the mobo will
> > support 133 fsb (the SD11 would need a bios upgrade to support pc-133 memory
> > at 133 mhz). I do not believe the memory bus runs at 2x the memory, I think
> > that 200mhz figure is the max. speed of the FSB.
>
> I'm surprised there has not been more discussion of the "200 MHz FSB". I
> believe it refers to the memory bus being able to use DDR-SDRAM (Double Data
> Rate SDRAM - data on both rise and fall of a clock cycle) when it becomes
> available in Dec.
The Athlon FSB in fact transmits data on rise and fall of one cycle.
It is clocked at 100MHz but is twice as fast as Intel's FSB of 100MHz
(and that's why marketing wants to sell it as 200MHz - that's data
rate, not clock rate). And this is not a future expansion possibility,
it does it right now.
It gets even cooler when you consider it won't have a bus for SMP like
Intel - where all CPUs share the bandwidth. Each Athlon will get the
full bandwidth to the chipset through individual ports instead of
sharing a bus.
--
Andreas E. Bombe <[EMAIL PROTECTED]>
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