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Thread: IBM takes the wraps off its 7nm Power10 processor

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    IBM takes the wraps off its 7nm Power10 processor

    It is 3x more efficient than the Power9. First Power10 systems expected H2 2021.
    Read more.

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    Re: IBM takes the wraps off its 7nm Power10 processor

    up to 15 smt8 cores yet the die shot clearly has 16....
    Old puter - still good enuff till I save some pennies!

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by 3dcandy View Post
    up to 15 smt8 cores yet the die shot clearly has 16....
    Might be disabled for yield purposes? Made by Samsung too on 7NM.


    Those despicable Elk,stealing the pond weed!

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by 3dcandy View Post
    up to 15 smt8 cores yet the die shot clearly has 16....
    Guess they don't expect perfect yields?

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Well yes - but that's a huge amount lopped off for yields...
    Surely they'd be fusing off poor cores on the lower end offerings instead to make a product stack like every other manufacturer does?
    Old puter - still good enuff till I save some pennies!

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by 3dcandy View Post
    Well yes - but that's a huge amount lopped off for yields...
    Surely they'd be fusing off poor cores on the lower end offerings instead to make a product stack like every other manufacturer does?
    Samsung's 7nm hasn't been used on anything more advanced than a mobile SoC, has it? It might just be that the yields at this size (602mm2 is enormous) and complexity are notably poor.

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by 3dcandy View Post
    Surely they'd be fusing off poor cores on the lower end offerings instead to make a product stack like every other manufacturer does?
    I don't think IBM really do low end offerings, the machines I have used started around the half a million quid mark and run *lots* of virtual machines so would be likely housing a few of these processors. Then there is the whole thing of shipping with more cores than the customer ordered and allowing them to buy an upgrade licence if their usage increases.

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by 3dcandy View Post
    Well yes - but that's a huge amount lopped off for yields...
    Not that unusual, given we're talking 16 core blocks with 8 threads per core it's presumably a large and complex chip. I suspect an extremely minor defect in any single core block could render it sufficiently unstable to need fusing off, and almost the entire chip is core blocks or associated cache...

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by scaryjim View Post
    Not that unusual, given we're talking 16 core blocks with 8 threads per core it's presumably a large and complex chip. I suspect an extremely minor defect in any single core block could render it sufficiently unstable to need fusing off, and almost the entire chip is core blocks or associated cache...
    Well surely in that case you'd modify the design to mitigate that. Extremely wasteful otherwise but hey maybe that's just me...
    Old puter - still good enuff till I save some pennies!

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by 3dcandy View Post
    Well surely in that case you'd modify the design to mitigate that. Extremely wasteful otherwise but hey maybe that's just me...
    It is just the execution units that are the problem.

    If you have a defect in the L1 or L2 cache that make up a lot of the area, then there will be spare lines that they can swap in to repair.

    You can't do spare bits of the main execution path though, as that would make them larger so the longer wire lengths would lead to slower clock speeds. Better to just allow for one bad core, and if all the cores work you can improve performance by killing off the weakest.

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    Re: IBM takes the wraps off its 7nm Power10 processor

    Quote Originally Posted by DanceswithUnix View Post
    It is just the execution units that are the problem.

    If you have a defect in the L1 or L2 cache that make up a lot of the area, then there will be spare lines that they can swap in to repair.

    You can't do spare bits of the main execution path though, as that would make them larger so the longer wire lengths would lead to slower clock speeds. Better to just allow for one bad core, and if all the cores work you can improve performance by killing off the weakest.
    Yes, while we enthusiasts keep talking about golden samples or getting very lucky in the die lottery, on such big chips the likelihood is that the cores will be far from equal. So they've probably used less than 1/16 die space not only to improve yields but also binning.

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    Re: IBM takes the wraps off its 7nm Power10 processor

    7nm wow !......... thats like what intels profit is going to be if it doesn't pull its finger out soon

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