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Old 05-23-2005, 03:02 PM   #1 (permalink)
Newb Techie
Join Date: May 2005
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Angry BUS concepts

I need a few things straight in my head, please help.

400 DDR RAM gives 400 million data transfers per second, 3200 MBps data rate over the FSB. Is it necessary to have 800 MHz FSB to run at this speed or just 400 FSB? If the latter is true then what is the point of 800 or 1000 FSB when, if I am correct in my thinking, the only DRAM that runs at 800 MHz is RDRAM?

So is the RAM running at 200MHz (it is called synchronised DRAM after all) with 2 data transfers per clock cycle (how) or 400 MHz? Or does it matter?

Is 333MHz the fastest FSB an Athlon XP can do? in the case detailed above, does the big FSB difference between P4s and Athlons matter?

Am I asking too many questions?

I definitely know I'm confused.

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Old 05-23-2005, 03:04 PM   #2 (permalink)
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If an FSB is 200Mhz then the RAM is also 200Mhz FSB, but because it is DDR, Double Data Rate, it runs twice that speed, 400Mhz.


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Old 05-23-2005, 03:13 PM   #3 (permalink)
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The high end Athlon-XPs (eg. 3000+ and 3200+) run at a 400MHz FSB speed. DDR400 runs at 200MHz.
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