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From: Henrik Carlqvist on 16 Jan 2010 02:37
Albretch Mueller <lbrtchx(a)gmail.com> wrote:
> Why is the comp. manufacturer advertising a FSB of 800 MHz?

> $ sudo dmidecode | grep Clock
> External Clock: 200 MHz
> External Clock: 200 MHz

I think that the explanation is that your external clock is going in 200
MHz but both the up and down flanks of the clock signal is used so this
equals the speed of 400 MHz. This is why your memory is said to have
"Double Data Rate", DDR.

I also think that your motherboard has its RAMs in pairs, accessing 128
bits at once instead of only 64 bits so this equals yet another multiplyer
with 2. So it all ends up with an FSB with a speed like 800 MHz.

Some links:

http://en.wikipedia.org/wiki/Memory_divider
http://en.wikipedia.org/wiki/Dual-channel_architecture

regards Henrik
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From: Pascal Hambourg on 16 Jan 2010 03:18
Hello,

Albretch Mueller a �crit :
>
> That seems to be it, but then I have a question. Why is the comp.
> manufacturer advertising a FSB of 800 MHz?

<http://en.wikipedia.org/wiki/Quad-pumped>
From: Bob Martin on 16 Jan 2010 03:20
in 9867 20100116 014941 Albretch Mueller <lbrtchx(a)gmail.com> wrote:

>External Clock: 200 MHz
>Max Speed: 1500 MHz
>Current Speed: 2800 MHz

i'm interested in these figures, as I get

External Clock: 200 MHz
Max Speed: 3000 MHz
Current Speed: 2100 MHz

Is my mobo too slow for my processor or have I got some settings wrong?
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