oh ok I see. I was under the impression that ram speed was just an independent factor. So the goal is a higer fsb speed with a lower divider? And if the ram says its rated at 400, does that mean your fsb will automatically run at 200?
oh ok I see. I was under the impression that ram speed was just an independent factor. So the goal is a higer fsb speed with a lower divider? And if the ram says its rated at 400, does that mean your fsb will automatically run at 200?
You might take a look at this link, I wrote it up a little while ago when I was trying to figure some of these things out. It tries to explain in more detail why and what you do.
So the goal is a higer fsb speed with a lower divider?
No but based on what I said you could draw that conclusion. The reason you would rather run at 166, instead of less, is that the memory is accessed synchronous at or above 166 instead of asynchronously below 166. Synchronous access yields better performance. There are some numbers quoted in the above link.
And if the ram says its rated at 400, does that mean your fsb will automatically run at 200?
No, most mobos will start out at either a fsb of 100 or 133 depending on jumpers or the bios. That is where you memory will start. The 200 rating (or DDR400) will only work at that level if you're able to set your fsb=200. Thus if you buy DDR400 memory and don't overclock it, you wasted your hard earned money.
for amd systems, memory speed= fsb * 2 period.
unless you have the memory set to +33 or +66. (asynchronous - which isnt worth the hassle) In which case, it would be
memory speed = fsb * 2 + 33 or,
memory speed = fsb * 2 + 66 respectivly
but the memory system doesnt run asnycronous unless you tell it to.
All this depends on the particular mobo in use. Thus both james.miller and I are right, or wrong, depending on how you want to look at that issue. I would say that we neither are clear enough. My statements are correct as relates to an Epox.
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