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Thread: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

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    Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    A leaked slide indicates they will. The same slide flags up low-end Comet Lake refresh CPUs too.
    Read more.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Typo. I'm confident on that one! it's 8 Core 16 thread. Typos in presentations by large companies are more common than many people might think.
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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    I thought it was a typo yesterday but there seems to be a few other hints it actually isn't, and it's just segmentation by multithreaded/multitasking performance, whilst providing 4 full non-SMT cores for higher performance needs. I think Intel are going to use multi-tasking (not just multithreading) benchmarks heavily here, they must have found a niche where they perform well still.

    Intel CPUs can now have SMT enabled/disabled on a per-core basis already, so this is just cementing that functionality in at the point of sale.

    Personally I think it's confusing for the consumer, when you can just adjust base-clocks down a bit for the i7 versus the i9.

    Alternatively, they have massive power consumption issues that are exacerbated by SMT, so they need to minimise that in the i7 to meet a TDP requirement.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by sykobee View Post
    Intel CPUs can now have SMT enabled/disabled on a per-core basis already, so this is just cementing that functionality in at the point of sale.
    But can the Windows scheduler deal with such a lack of symmetry?

    8C/8T just seems so much more likely.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by DanceswithUnix View Post
    But can the Windows scheduler deal with such a lack of symmetry?
    It's going to have to with the the big-little type CPUs on the way. There's already 'preferred' core type scheduling as well.

    eg: https://www.anandtech.com/show/15877...u-need-to-know

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    It could be so they can put non-critical threads on the SMT enabled cores and critical security conscious threads on the non SMT enabled cores as Hyper Threading should be disabled if you want security

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by kalniel View Post
    It's going to have to with the the big-little type CPUs on the way. There's already 'preferred' core type scheduling as well.

    eg: https://www.anandtech.com/show/15877...u-need-to-know
    My biggest issue here is that the chip below in the stack is 6C/12T, and the one above is 8C/16T. So *those* chips seem to be pretty conventional, which to me makes little sense to do some screwball threading layout in the chip between them which is bound to cause scheduling anomolies. Compare that to the conventional Intel idea that you just switch off threading on the i7 to make an i5, this smacks of typo.

    Besides, the big-little style is a lot more clear cut, stuff that dawdles gets farmed out to the Atom cores, bursts of furious activity go to the big core(s). There's some tuning in where the cutoff is, but the principle is easy. But threaded vs non threaded big cores? Whilst there could be reasons for that (ie laying out the non threaded cores to favour low power consumption and not be able to clock as high) if they just switched the threading off on half the cores then when do you use them? You also can't always use all those cores on the same program, interactive performance always follows the slowest core though it would benefit bulk compute programs like Blender.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Only 8 cores on the i9? Either they're expecting >25% per-core performance gains, or the multicore performance will go down compared to 10th gen

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Seems to me that Intel are reacting to AMD here, Ryzen 5, 6c/12t, and so on, so for the i5 to follow suit isn't exactly unexpected..

    I might put off my server re/size/build until new things are released..

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by DanceswithUnix View Post
    My biggest issue here is that the chip below in the stack is 6C/12T, and the one above is 8C/16T. So *those* chips seem to be pretty conventional, which to me makes little sense to do some screwball threading layout in the chip between them which is bound to cause scheduling anomolies. Compare that to the conventional Intel idea that you just switch off threading on the i7 to make an i5, this smacks of typo.
    Certainly it makes it simpler to have all HT or no HT.

    Besides, the big-little style is a lot more clear cut, stuff that dawdles gets farmed out to the Atom cores, bursts of furious activity go to the big core(s). There's some tuning in where the cutoff is, but the principle is easy. But threaded vs non threaded big cores? Whilst there could be reasons for that (ie laying out the non threaded cores to favour low power consumption and not be able to clock as high) if they just switched the threading off on half the cores then when do you use them? You also can't always use all those cores on the same program, interactive performance always follows the slowest core though it would benefit bulk compute programs like Blender.
    If real, I think it's more likely they'll boost the non threaded cores higher, so you just set them as preferred cores which is possible in the existing scheduler logic. Then under lightly threaded situations you're using faster non HT cores and only under highly threaded loads do you spill into the HT cores.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by kalniel View Post
    Quote Originally Posted by DanceswithUnix View Post
    My biggest issue here is that the chip below in the stack is 6C/12T, and the one above is 8C/16T. So *those* chips seem to be pretty conventional, which to me makes little sense to do some screwball threading layout in the chip between them which is bound to cause scheduling anomolies. Compare that to the conventional Intel idea that you just switch off threading on the i7 to make an i5, this smacks of typo.
    Certainly it makes it simpler to have all HT or no HT.

    Besides, the big-little style is a lot more clear cut, stuff that dawdles gets farmed out to the Atom cores, bursts of furious activity go to the big core(s). There's some tuning in where the cutoff is, but the principle is easy. But threaded vs non threaded big cores? Whilst there could be reasons for that (ie laying out the non threaded cores to favour low power consumption and not be able to clock as high) if they just switched the threading off on half the cores then when do you use them? You also can't always use all those cores on the same program, interactive performance always follows the slowest core though it would benefit bulk compute programs like Blender.
    If real, I think it's more likely they'll boost the non threaded cores higher, so you just set them as preferred cores which is possible in the existing scheduler logic. Then under lightly threaded situations you're using faster non HT cores and only under highly threaded loads do you spill into the HT cores.
    If that's true, then the only reason I can think for it is to "winning the benchmarks".

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by [GSV]Trig View Post
    Seems to me that Intel are reacting to AMD here, Ryzen 5, 6c/12t, and so on, so for the i5 to follow suit isn't exactly unexpected..

    I might put off my server re/size/build until new things are released..
    Current i5's are 6C/12T

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Shows how out of the loop I am, I've got an i5 3470 here

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by kalniel View Post
    It's going to have to with the the big-little type CPUs on the way. There's already 'preferred' core type scheduling as well.

    eg: https://www.anandtech.com/show/15877...u-need-to-know
    Lakefield is already in devices and Windows appears to be entirely unaware of it, so I wouldn't confidently assume it'll ever be managed efficiently.

    The performance delta between 8/12 and 8/16 has got to be microscopic. Especially at a similar 125W TDP, or whatever they claim on them.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Quote Originally Posted by DevDrake View Post
    If that's true, then the only reason I can think for it is to "winning the benchmarks".
    I don't think you win benchmarks by throwing Microsoft a curveball cpu layout. Not when a simple 8C/8T would in many games be faster than an 8C/16T version as had been shown over and over by turning off threading on i7 and Ryzen parts.

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    Re: Will Intel Rocket Lake-S Core i7 processors come with 8C/12T?

    Feels either like typo, or they are experimenting with something. I doubt they will do big little design with Rocket Lake, with fast non-Hyoerthreaded cores and slower Hyperthreaded cores for multitasking and heavier stuff. With 4 cores with Hyperthreading and 4 without. But could be that they might selectively disable Hyperthreading on some cores to force Microsoft to update Windows task scheduler to work with non-symetric architecture to prepare for big little design. Since I doubt process would be smooth and that could get stuff fixed till then. Just like nVidia got raytracing out with RTX cards, so developers can start using it, even if performance is poor and if will take another generation to get good raytracing performance. But unlike before, world is far more ready for adoption.

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