The Intel Core i7 Memory Bandwidth

Discussion in 'Reviews & Articles' started by Dashken, Nov 14, 2008.

  1. Dashken

    Dashken Administrator!

    We have always advocated larger memory capacities over higher memory bandwidth to improve a PC's real-world performance. The effect of high memory bandwidth have always been overhyped by memory vendors, because it makes good business sense. This is the situation we now see with the introduction of the new Intel Core i7 processor.

    The Core i7 processor supports up to three DDR3 memory channels. Using DDR3-1333 memory, triple-channels would give you a memory bandwidth of 64 GB/s. That is a tremendous amount of memory bandwidth. But do we really, really need that kind of bandwidth? That is what we will be looking at today.


    Link : The Intel Core i7 Memory Bandwidth
  2. g0tanks

    g0tanks Newbie

    Nice article, but of course this was expected :p
  3. nikos

    nikos Newbie

    What about the opposite?

    Very good article.

    I read somewhere else (cant remember where)

    that although you may have sufficient bandwidth,

    you can under-voltage the RAM and other tweaks to get very low latency 5-5-5 or lower?

    Could you get a stable system doing that?
    Would there be a read advantage in doing so?


  4. Adrian Wong

    Adrian Wong Da Boss Staff Member

    Reduce voltage to reduce latency? I don't think that's possible... Maybe if you reduce the clock speed.
  5. g0tanks

    g0tanks Newbie

    Isn't it the other way around? Don't you need to increase voltage to lower timings?
  6. boltonblue

    boltonblue Newbie

    benchmark applicability

    The author indicates the following
    This would be indicative of an application which is CPU bound.
    As a consequence, memory bandwidth once it has satisfied the CPU requirement becomes irrelevant to execution time.
  7. Unixlord

    Unixlord Newbie

    I was expecting some everest ultimate edition memory benchmark results alongside it.
  8. Adrian Wong

    Adrian Wong Da Boss Staff Member

    Indeed. That's why memory bandwidth is kinda "irrelevant" for the Core i7. There's so much memory bandwidth, you do not have to bother overclocking the RAM or even use high-speed DDR3 memory.
  9. ssj4Gogeta

    ssj4Gogeta Newbie

    Maybe this will change when Gulftown is launched. It's 6 cores will have higher memory bandwidth requirements to keep them fed. QPI seems more like a preparation for the multi-core era ahead. Still, I feel 3 channels on i7 weren't necessary. Lynnfield's 2 channels should deliver similar memory performance. But, again, you don't get a hexa-core on LGA1156, probably due to bandwidth limitation.

    Btw, this is my first post here.:wave:
  10. Adrian Wong

    Adrian Wong Da Boss Staff Member

    Welcome!! :thumb: :thumb:
  11. ssj4Gogeta

    ssj4Gogeta Newbie

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