Don’t call it Knots Landing: next Xeon Phi detailed

Intel's sequel to Knight's Corner is more than just a fresh coat of paint. We've been hearing about the Xeon Phi successor for a while now, and the company released a torrent of new information at Hot Chips, detailed by Serve The Home.

Knights Landing-based Xeon Phis (Xeons Phi?) are built using tiles. A tile contains a pair of x86 cores based on the Silvermont microachitecture with customizations for HPC, which are fed by 1MB of L2 cache. Each core can track and execute four hardware threads. Within every core is a pair of vector processing units (totaling four per tile) that can be programmed using the AVX-512 instruction set extensions.

The Xeon Phi uses 36 of these tiles connected by a 2D mesh interconnect for a total of 72 cores, 144 VPUs, and 288 hardware threads. Intel then heaps on 16GB of on-package multi-channel DRAM (MCDRAM), which is Intel's high-bandwidth memory technology and not to be confused with AMD's HBM solution. The processor also has a six-channel DDR4-2400 memory controller for when 16GB isn't enough. 

Much like previous models in the family, Intel is pimping the Xeon Phi's x86 compatability as a big bonus over competing solutions like Nvidia's Tesla or AMD's FirePro compute cards. Multiple Xeon Phi processors can be strung together, talking to each other over PCI-express or the Omni-Path Architecture fabric

We already know about the US Department of Energy's supercomputer project. Now that the latest Xeon Phi family has been announced, we expecte more such projects will be on the way. 

Ben Funk

Sega nerd and guitar lover

Comments closed
    • rds
    • 4 years ago

    The article say ‘Each core has 1MB of L2 cache and can track and execute four hardware threads’, the diagram says per tile.

      • rds
      • 4 years ago

      Actually reading the original article there is a slide that says 4 way SMT, but I still think its 1MB L2 per tile.

        • derFunkenstein
        • 4 years ago

        You’re right, the 1MB L2 is per-tile. The post has been updated. Thanks!

    • Tairc
    • 4 years ago

    Does anyone know the target SP/DP FLOPs on this thing? I mean, just the x86 cores alone could do (let’s say) 2 DPFLOPs per cycle, while those vector units are obviously capable of 8 DPFLOPs per cycle (or more if they ‘cheat’ with the fused MAC instruction), so even if it only hits 1GHz, that’s 72*2+144*8=1296 FPOPs/cycle, for something like 1.3 teraflops.

    If anyone had more realistic numbers than that, I’d be interested. Also, power envelope?

      • chuckula
      • 4 years ago

      It does 3TFlops double precision and 6 TFlops single precision.

      Power envelope is less well defined, but I’d guesstimate it in the 250 – 300 watt range.

        • eofpi
        • 4 years ago

        Those are peak numbers, which means FMA. Figure a bit over half that for non-fused ops, which suggests a clock speed around 1.2GHz. Knights Corner operates around that speed.

    • TopHatKiller
    • 4 years ago

    Does this still have video i/o in the chip, that [b<]I[/b<] [good glory the name inspires] have fused out again? [humpff. nobody got that then.]

    • Chrispy_
    • 4 years ago

    What’s with all the 1996 Microsoft Powerpoint with Clipart slides coming out of Intel at the moment?

    Are they just getting lazy or did they figure that if AMD can get away without a marketing department, they don’t need to bother with presentation anymore?

      • lilbuddhaman
      • 4 years ago

      To match Windows 10

    • Waco
    • 4 years ago

    Trinity, the next big system at LANL, will have KNL in phase 2 (mid/late next year). These have been in planning for a very long time!

    • DancinJack
    • 4 years ago

    “The processor can also has a six-channel DDR4-2400 memory controller for when 16GB isn’t enough. ”

    Come on Funk!

    edit: another one! spelling and word duplication in this one!

    “Much like previous the previous models in the family, Intel is pimping the Xeon Phi’s x86 compatability as a big bonus over competing solutions like Nvidia’s Tesla or AMD’s FirePro compute cards. “

      • derFunkenstein
      • 4 years ago

      I don’t see those, do you? πŸ˜‰

      • UberGerbil
      • 4 years ago

      I can has grammar?

    • Flatland_Spider
    • 4 years ago

    Don Knots Landing then?

      • willmore
      • 4 years ago

      Don’t cross the streams.

      • derFunkenstein
      • 4 years ago

      AMD gets that show, where Barney Fife keeps shooting himself in the foot.

    • Deanjo
    • 4 years ago

    [quote<]Don't call it Knots Landing[/quote<] You see kids, there was something called a "soap opera" at one time and "Knots Landing" was one of the more popular ones.* *clarified for the Pokemon generation that makes up the majority here

      • chuckula
      • 4 years ago

      Meh. I’m a Falcon Crest fanboy!

        • FanlessTech
        • 4 years ago

        OMG Falcon Crest was perfect. Jane Wyman, the guest stars, the early CGI opening credits, the Mark Snow music. Obsessed.

      • sweatshopking
      • 4 years ago

      ☜(βŒ’β–½βŒ’)☞ OMG I LOOOOOOVVVEEE POKEMON!! SO CUTE AND FLUFFY! AND I JUST LOVE LEARNING ABOUT THEM ALL!! SO MANY DIFFERENT KINDS! IN MY JOURNAL I WRITE ABOUT ALL THE THINGS I’D DO IF THEY WERE REAL!!!! (q◕‿◕q)

        • willmore
        • 4 years ago

        auxy, give SSK back his login!

          • maxxcool
          • 4 years ago

          LOL

          • auxy
          • 4 years ago

          . . . ( οΎŸΠ”οΎŸ)

          • YukaKun
          • 4 years ago

          That made me LOL for real.

          Have a thumbs up.

          Cheers!

        • Pwnstar
        • 4 years ago

        All the things you’d do to them, eh?

          • willmore
          • 4 years ago

          You had to go all Rule #41, huh?

        • VincentHanna
        • 4 years ago

        Totally trolled me. I thought it was Auxy.

        Should have known though, I can never tell what her silly little pictures are supposed to be.

      • I.S.T.
      • 4 years ago

      >_> I know you’re being sarcastic, but Soaps still exist. Like, every day on NBC, CBS, etc.

      • LostCat
      • 4 years ago

      Soap operas and pokemon, two things I will never care about.

    • Ninjitsu
    • 4 years ago

    Is [url=http://images.anandtech.com/doci/9561/OPADetails.png<]Knights Hill[/url<] the successor to Landing?

      • Damage
      • 4 years ago

      Yep.

    • chuckula
    • 4 years ago

    There are pictures of the die but I don’t know the package dimensions.

    Free upthumbs to the first person who counts the pixels for a die-size estimate.

      • Generic
      • 4 years ago

      free [desirable thing] in exchange for [work]…

      You broke my thinker!

      • Pwnstar
      • 4 years ago

      It’s not “free” if you had to work for it.

        • chuckula
        • 4 years ago

        Pffft… stop being so self-centered.

        When I said “free upthumbs” I was noting that I wasn’t going to have to pay to give you the upthumbs. Therefore, they are free.

      • Chrispy_
      • 4 years ago

      it’s over 9000 pixels.

        • Generic
        • 4 years ago

        What is: “How much is Kakarrot’s battle power”?, Alex.

    • chuckula
    • 4 years ago

    DO call it Knotts Berry Farms!

      • destroy.all.monsters
      • 4 years ago

      Knott again!

    • UberGerbil
    • 4 years ago

    I’ll take “Rightfully Forgotten Primetime Soap Operas” for $400, Alex.

    And I thought I was being retro by referencing Swayze in a comment…

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