What's the point in XMP?

Man of Honour
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25 Oct 2002
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One thing that has always bugged me, is why does RAM get marketed and sold based on its XMP speed and timings, yet doesn't run at those speeds by default? Just seems a bit of a faff and makes life harder for less experienced system builders. I mean say you buy 3200mhz RAM why doesn't it just get detected and run at 3200mhz out of the box? I know the technical reason i.e. it will have slower JEDEC timings but what I'm getting at is why is there even this discrepancy with two sets of timings, why not just have one set of timings/speed/voltage etc?

I guess it must be something to do with avoiding compatibility issues with certain boards and ensuring the system can POST by running lower speeds, but it just seems a bit odd to me. I mean if XMP is 'pushing the limits' why is it even allowed to advertise it at those levels?
 
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