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How can PC3200 run at 300 FSB?

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perdomot

Golden Member
If you look at Anandtech's review of the DFI UT NF3-250 mobo, you see that they used PC3200 memory running at 1:1 with the FSB and they got it all the way up to 308. I don't understand how this can be considering PC3200 is rated for running at 200FSB. On older systems, I've seen 220-240 over the rated speed but 100? I'm sure it has something to do with the onboard memory controller but I've never seen it explained. Can someone enlighten me here? Thanks.
 
The rating has nothing to do with it. Often, the same chips will be used in DDR500 CL2.5 and DDR400 2-2-2-5 from the same manufacturer, and these are what matter.
 
Speed binning is done with memory too. PC3200 is the fastest official standard, but it can be made with chips that are capable of higher speeds, such as the Samsung TCCD chips.
 
Originally posted by: perdomot
If you look at Anandtech's review of the DFI UT NF3-250 mobo, you see that they used PC3200 memory running at 1:1 with the FSB and they got it all the way up to 308. I don't understand how this can be considering PC3200 is rated for running at 200FSB. On older systems, I've seen 220-240 over the rated speed but 100? I'm sure it has something to do with the onboard memory controller but I've never seen it explained. Can someone enlighten me here? Thanks.
Click to expand...

They used ddr 500 rated chips to make a ram that would also do 2-2-2-5
 
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