First impressions of Nvidia's Kepler

Article: Impressions of Kepler
By: David Kanter (dkanter.delete@this.realworldtech.com), March 23, 2012 9:02 am
Room: Moderated Discussions
Mike (nobody@nowhere.com) on 3/23/12 wrote:
---------------------------
>Great article, thanks!
>
>I am not sure I will be able to port my GPGPU app to run efficiently on Kepler
>exactly for the reason described in this article: there are too few registers and
>too little shared memory per compute core.
>
>The author's suggestion that nVidia will release a product >with higher B/FLOP seems
>to contradict the rumors that future Kepler GPUs GK110 will >feature 3K+ cores.

Please do not call execution units cores. That's Nvidia's rather confusing (and wrong) marketing-speak.

Kepler has 1.5K execution units, but only 8 cores. A core needs to be able to fetch instructions, decode instructions, schedule them (unless it's statically scheduled), execute instructions, access a data cache and write results back to a register file.

What Nvidia calls a "CUDA Core" can only do one of those.

Sorry, but this terminology difference really irritates me : )

>Following
>these rumors, it seems that this future GPU will be >essentially two FK104 merged into one chip.

I don't see how that is a contradiction.

I was discussing the bandwidth from shared memory, which is really a reflection of the core design. There's no reason they cannot have fewer execution units per core (or perhaps more shared memory/core) and simultaneously scale up the number of cores.

If you believe they are going to have a ~500mm2 design, I think it's more reasonable to expect about ~1.5X in overall FLOP/s.

David
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
First impressions of Nvidia's KeplerDavid Kanter2012/03/22 06:00 PM
  First impressions of Nvidia's Keplerfellix2012/03/23 01:25 AM
  First impressions of Nvidia's KeplerMike2012/03/23 08:24 AM
    First impressions of Nvidia's KeplerDavid Kanter2012/03/23 09:02 AM
      First impressions of Nvidia's KeplerMike2012/03/23 09:34 AM
        First impressions of Nvidia's KeplerDavid Kanter2012/03/23 12:15 PM
      First impressions of Nvidia's Kepleranon2012/03/23 11:37 AM
        I use ALUsMark Roulo2012/03/23 12:59 PM
          I use ALUsanon2012/03/23 02:07 PM
            I use ALUsMark Roulo2012/03/23 03:12 PM
              I use ALUsanon2012/03/23 04:08 PM
        Makes no sense...EduardoS2012/03/23 05:30 PM
          Makes no sense...anon2012/03/23 06:14 PM
            Makes no sense...David Kanter2012/03/25 10:45 AM
          Makes no sense...fellix2012/03/24 05:41 AM
  Comparing against the 560Cat2012/03/26 08:51 AM
    Comparing against the 560David Kanter2012/03/26 09:24 AM
  Shuffle InstructionMartin2012/03/27 06:17 AM
    Shuffle InstructionDavid Kanter2012/03/27 08:47 AM
      Shuffle InstructionMartin2012/03/27 10:52 AM
        .msi unarchiver?hobold2012/03/28 10:20 AM
          .msi unarchiver?Joe2012/03/28 12:55 PM
          .msi unarchiver?Martin2012/03/29 12:53 AM
      Shuffle InstructionRohit2012/03/27 12:04 PM
  Workgroups vs. warps/wavefrontsAndrew McDonald2012/03/28 02:31 PM
    Workgroups vs. warps/wavefrontsDavid Kanter2012/03/28 03:14 PM
      Workgroups vs. warps/wavefrontsRohit2012/03/28 08:53 PM
        Workgroups vs. warps/wavefrontsLee Howes2012/03/29 06:38 AM
          ThreadsDavid Kanter2012/04/09 11:36 AM
    Fixed (NT)David Kanter2012/04/09 11:37 AM
  Heterogeneous GPUsOscar Eddington2012/03/28 07:41 PM
    Heterogeneous GPUsGary M.2012/04/06 04:35 PM
      Different shader coresDavid Kanter2012/04/09 11:29 AM
        Different shader coresTom2012/04/11 02:36 PM
          Nope...David Kanter2012/04/12 01:10 AM
            Nope...Tom2012/04/13 03:58 PM
              Nope...David Kanter2012/04/14 12:24 PM
                Load balancing between Tesla and graphics boardsTom2012/04/15 06:11 PM
                  Load balancing between Tesla and graphics boardsDavid Kanter2012/04/15 10:11 PM
                    Load balancing between Tesla and graphics boardsAnon2012/04/16 05:05 PM
  Why isn't AMD hardware used for GPU computing?Richard G.2012/04/03 07:39 PM
    Why isn't AMD hardware used for GPU computing?anon2012/04/04 03:11 AM
      Why isn't AMD hardware used for GPU computing?Soupdragon2012/04/04 05:24 AM
        Why isn't AMD hardware used for GPU computing?Groo2012/04/04 08:41 AM
      Why isn't AMD hardware used for GPU computing?Michael S2012/04/04 06:24 AM
      Why isn't AMD hardware used for GPU computing?Alexko2012/04/04 08:43 AM
        Why isn't AMD hardware used for GPU computing?EduardoS2012/04/04 03:37 PM
          Why isn't AMD hardware used for GPU computing?David Kanter2012/04/09 02:51 PM
    Why isn't AMD hardware used for GPU computing?Ricardo B2012/04/04 12:57 PM
    Why isn't AMD hardware used for GPU computing?Tom2012/04/04 05:36 PM
      Why isn't AMD hardware used for GPU computing?Brett2012/04/04 06:55 PM
      Why isn't AMD hardware used for GPU computing?David Kanter2012/04/09 02:55 PM
  Predictions about KeplerRussell Baker2012/04/18 02:09 PM
    Predictions about Kepler01000102012/04/18 03:14 PM
      Predictions about KeplerEduardoS2012/04/18 03:38 PM
        Predictions about KeplerAnon2012/04/18 08:48 PM
          Predictions about KeplerEduardoS2012/04/19 03:03 PM
            Predictions about KeplerMeeps2012/04/19 03:39 PM
      Predictions about KeplerJohn P.2012/04/18 06:13 PM
      Predictions about KeplerFoo_2012/04/19 12:15 PM
        Predictions about KeplerEduardoS2012/04/19 03:07 PM
    Predictions about KeplerGroo2012/04/19 09:13 AM
      Predictions about Kepleranon2012/04/19 03:26 PM
        Predictions about KeplerGroo2012/04/20 08:01 AM
    Predictions about KeplerAlex L.2012/04/20 03:41 PM
      Predictions about KeplerAnon2012/04/21 09:34 AM
        Predictions about Keplermpx2012/04/21 11:23 PM
          Predictions about Keplerac2012/04/22 01:49 AM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell avocado?