X79, ram, and f@h
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January 25, 2012, 12:07 PM
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Originally Posted by
This was a bigger hit than I would have thought going from dual to quad channel, maybe there's something else going on that I'm missing, but thought I'd share.
We saw something similar with the 2P and 4P G34 rigs insomuch as there was a considerable amount of performance to be gained from higher frequency/lower latency RAM in quad-channel. It's interesting because that was essentially the first platform to witness a gain in FAH performance from RAM. By comparison, LGA1366 provided no discernible difference in switching between tri-channel or dual-channel.
Having said that, I share your surprise. I figured part of the reason why memory bandwidth made as much of a difference on G34 is because each processing thread needs its own address space, so a large MP system would depend more heavily on RAM performance. Your findings, though, would suggest it has more to do with the quad-channel bandwidth itself being particularly agreeable to FAH. This is indeed interesting. Thanks for sharing!
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