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Originally Posted by G777  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!