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ARM Cortex-A15 vs. NVIDIA Tegra 3 vs. Intel x86

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  • #31
    Originally posted by artivision View Post
    It's only 2.5Wp.
    How do you know exynos5250 tdp?

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    • #32
      Originally posted by Tempestglen View Post
      How do you know exynos5250 tdp?
      It happens to know some how. To be precise, the thing consumes the 70% of the previous Exynos4.

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      • #33
        Originally posted by artivision View Post
        It happens to know some how. To be precise, the thing consumes the 70% of the previous Exynos4.

        Exynos5250 TDP is 70% of quad core exynos4412@1.6Ghz?

        I estimated 5250 TDP=5w, hope I am wrong.

        Comment


        • #34
          Originally posted by Tempestglen View Post
          Exynos5250 TDP is 70% of quad core exynos4412@1.6Ghz?

          I estimated 5250 TDP=5w, hope I am wrong.

          Exynos5-dual has 2/3 the consumption of the Exynos4-dual, not dual vs quad. The Exynos5-quad (2*A15 + 2*A7) has 1/2 the consumption of Exynos4-quad. And i don't understand how you estimate Exynos4-quad at 5-8Wp, 5Wp has a quad-A9@3.1ghz at 40nm-HP from known company.

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          • #35
            Originally posted by artivision View Post
            Exynos5-dual has 2/3 the consumption of the Exynos4-dual, not dual vs quad. The Exynos5-quad (2*A15 + 2*A7) has 1/2 the consumption of Exynos4-quad. And i don't understand how you estimate Exynos4-quad at 5-8Wp, 5Wp has a quad-A9@3.1ghz at 40nm-HP from known company.
            http://www.anandtech.com/show/6422/s...s-cortex-a15/7

            Samsung Chromebook Power Consumption Comparison
            Display Off Idle Kraken (Avg) Kraken (Peak)
            Samsung Chromebook 500 (Atom N570) 8.82W 11.4W 12.4W
            Samsung Chromebook 303 (Exynos 5 Dual) 4.07W 8.32W 9.27W

            On chromebook XE303,Kraken-Idle=power of (Cpu+memory)=4.2w, I estimate 8X256M DDR3L consumes 2w during kraken test, so cpu consumption is around 2.4w@kraken test. And kraken test couldn't utilities 2 core of exynos5250 completely, so let's double the power of exynos5250, that is 5w.

            BTW, under load memory consumption: DDR3(1.5v)>DDR3L(1.35v)=DDR3L-RS>DDR4>LPDDR2/3.

            When idle, DDR3L-RS < DDR3L.

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            • #36
              Originally posted by Tempestglen View Post
              http://www.anandtech.com/show/6422/s...s-cortex-a15/7

              Samsung Chromebook Power Consumption Comparison
              Display Off Idle Kraken (Avg) Kraken (Peak)
              Samsung Chromebook 500 (Atom N570) 8.82W 11.4W 12.4W
              Samsung Chromebook 303 (Exynos 5 Dual) 4.07W 8.32W 9.27W

              On chromebook XE303,Kraken-Idle=power of (Cpu+memory)=4.2w, I estimate 8X256M DDR3L consumes 2w during kraken test, so cpu consumption is around 2.4w@kraken test. And kraken test couldn't utilities 2 core of exynos5250 completely, so let's double the power of exynos5250, that is 5w.

              BTW, under load memory consumption: DDR3(1.5v)>DDR3L(1.35v)=DDR3L-RS>DDR4>LPDDR2/3.

              When idle, DDR3L-RS < DDR3L.

              No, no, no. Don't take all those for real. They measure the entire board that is different from smartphone boards. My personal tests only with a cpu say this: A9-single (13m transistor) @2ghz 65nm-HP =950mWp. The same at 45nm-HP =500mWp, and 40nm-LP =350mWp. The same at 28nm-LPE =200mWp, and for dual core 400mWp. If we assume that an A15 consumes 2x as it is, and 3x with the 32nm-Samsung, then 2.5Wp for the entire SOC with graphics and without memory its fine. For example the dual A15 inside the new iPhone what do you thing it consumes? If it was 5Wp without memory then the device will power off in 15 minutes full use.

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              • #37
                Originally posted by artivision View Post
                No, no, no. Don't take all those for real. They measure the entire board that is different from smartphone boards. My personal tests only with a cpu say this: A9-single (13m transistor) @2ghz 65nm-HP =950mWp. The same at 45nm-HP =500mWp, and 40nm-LP =350mWp. The same at 28nm-LPE =200mWp, and for dual core 400mWp. If we assume that an A15 consumes 2x as it is, and 3x with the 32nm-Samsung, then 2.5Wp for the entire SOC with graphics and without memory its fine. For example the dual A15 inside the new iPhone what do you thing it consumes? If it was 5Wp without memory then the device will power off in 15 minutes full use.
                I don't know how you measure the CPU power, the anandtech nexus 10 review will tell us interesting story about A15.

                BTW,apple A6 is not A15, it's called "swift".

                Comment


                • #38
                  Originally posted by Tempestglen View Post
                  http://www.anandtech.com/show/6422/s...s-cortex-a15/7

                  Samsung Chromebook Power Consumption Comparison
                  Display Off Idle Kraken (Avg) Kraken (Peak)
                  Samsung Chromebook 500 (Atom N570) 8.82W 11.4W 12.4W
                  Samsung Chromebook 303 (Exynos 5 Dual) 4.07W 8.32W 9.27W

                  On chromebook XE303,Kraken-Idle=power of (Cpu+memory)=4.2w, I estimate 8X256M DDR3L consumes 2w during kraken test, so cpu consumption is around 2.4w@kraken test. And kraken test couldn't utilities 2 core of exynos5250 completely, so let's double the power of exynos5250, that is 5w.

                  BTW, under load memory consumption: DDR3(1.5v)>DDR3L(1.35v)=DDR3L-RS>DDR4>LPDDR2/3.

                  When idle, DDR3L-RS < DDR3L.
                  "And kraken test couldn't utilities 2 core of exynos5250 completely, so let's double the power of exynos5250, that is 5w."

                  Exynos 5250 only has TWO cores. It's not a quad core.

                  Comment


                  • #39
                    Originally posted by Figueiredo View Post
                    I don't understand cpu archtecture enought, maybe you guys will help clarify. How much o the CPU modern CPU archtecture is linked to the ISA? I mean, would it take too much work to say port Piledriver/Steamroller/Excavator to accept ARM ISA? Would the same apply to Haswell/Broadwell/etc? ARM is constantly bashed by being too low performance, but does the performance has anything to do with the ISA or is it simply because nobody has released a high power ARM chip yet?
                    It is the microarchitecture that is the issue, not the ISA. It is not that they don't have the knowledge to build it, but that it is not targeted. They can easily add more functional units to the pipeline, create a more aggressive cache, and add more hardware techniques that increases performance, but all that comes at the cost of more power which no current company is interested it.

                    Comment


                    • #40
                      Originally posted by Krysto View Post
                      "And kraken test couldn't utilities 2 core of exynos5250 completely, so let's double the power of exynos5250, that is 5w."

                      Exynos 5250 only has TWO cores. It's not a quad core.

                      2-core exynos5250 consumes 2.5w during kraken test, and consumes 5w during linpack, my estimate.

                      Comment


                      • #41
                        Originally posted by artivision View Post
                        No, no, no. Don't take all those for real. They measure the entire board that is different from smartphone boards. My personal tests only with a cpu say this: A9-single (13m transistor) @2ghz 65nm-HP =950mWp. The same at 45nm-HP =500mWp, and 40nm-LP =350mWp. The same at 28nm-LPE =200mWp, and for dual core 400mWp. If we assume that an A15 consumes 2x as it is, and 3x with the 32nm-Samsung, then 2.5Wp for the entire SOC with graphics and without memory its fine. For example the dual A15 inside the new iPhone what do you thing it consumes? If it was 5Wp without memory then the device will power off in 15 minutes full use.
                        Iphone has a 6whr battery, that can last for one hour if soc+screen power is 6w.

                        Comment


                        • #42
                          Could you test with GCC 4.7? You can get it from this PPA: ppa:ubuntu-toolchain-r/test It works on Chromebook and should work on all the other platforms. I saw some pretty substantial performance gains, around 15% in the one thing I tried.

                          Originally posted by Tempestglen View Post
                          http://www.anandtech.com/show/6422/s...s-cortex-a15/7

                          Samsung Chromebook Power Consumption Comparison
                          Display Off Idle Kraken (Avg) Kraken (Peak)
                          Samsung Chromebook 500 (Atom N570) 8.82W 11.4W 12.4W
                          Samsung Chromebook 303 (Exynos 5 Dual) 4.07W 8.32W 9.27W

                          On chromebook XE303,Kraken-Idle=power of (Cpu+memory)=4.2w, I estimate 8X256M DDR3L consumes 2w during kraken test, so cpu consumption is around 2.4w@kraken test. And kraken test couldn't utilities 2 core of exynos5250 completely, so let's double the power of exynos5250, that is 5w.

                          BTW, under load memory consumption: DDR3(1.5v)>DDR3L(1.35v)=DDR3L-RS>DDR4>LPDDR2/3.

                          When idle, DDR3L-RS < DDR3L.
                          I think doubling the power consumption due to CPU utilization is too harsh. While Kraken is a single threaded benchmark the Linux kernel (on Chromebook, and elsewhere according to my observations) likes to constantly swap which core things are running on. That's going to make it hard to power down the core, and Exynos 5 doesn't have any asynchronous DVFS so both cores are always clocked at 1.7GHz. You get some power savings from the core going idle but all of the swapping may even affect this. Android is hopefully better about allowing cores to be powered down when you don't need them.

                          Then we don't know where the power was being measured, if it was on the battery or at the wall. Either will incur an efficiency hit that'll be larger the higher the load is. On tablets and Chromebook ~7.2V batteries are usually used, because they're more efficient for the displays (which typically use the most power) but less efficient for the SoC. On phones the situation is reversed so ~3.7V batteries are used. In this case you'll see less power consumption from the SoC, but either way it doesn't impact its TDP. That along with more power efficient (LPDDR2/3, PoP) and probably lower clocked memory will help save power on phones, and it's possible that the Exynos 5 in the package on Chromebook is a leakier variant.

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                          • #43
                            "Current limitations though of running Ubuntu 12.04 on the Samsung Chromebook is that the touchpad didn't work at all for me (some users have reported success), sound is broken, and there isn't any hardware graphics acceleration at this time."

                            at the time you posted this
                            Michael
                            there was already the arm blog you could have used
                            http://blogs.arm.com/software-enable...-3-chromebook/
                            Posted byAndrew Wafaa, 6 COMMENTS
                            19 November 2012

                            14. The touchpad requires an additional configuration file called 50-touchpad.conf placed into /etc/X11/xorg.conf.d/ Using your preferred text editor create the required file
                            (I’m using Vim)
                            sudo vi etc/X11/xorg.conf.d/50-touchpad.conf
                            Add the contents below
                            Section "InputClass"
                            Identifier "touchpad"
                            MatchIsTouchpad "on"
                            Option "FingerHigh" "5"
                            Option "FingerLow" "5"

                            EndSection

                            15. To get audio working copy the contents of ...



                            oh and you probably also missed the
                            ODROID-U: mini-PC with 1.4 GHz quad-core Exynos SoC for $69 re-fresh news too






                            http://www.hardkernel.com/renewal_20...=G135341370451

                            you should probably get a few of those cheap Exynos4 Quad A9's and add them to your existing cluster to give it a big boost

                            the U2 Prime 1.7GHz Mali-400, 2 GB of memory and x2 Prime 1.7GHz are over clockable to 2gig so worth a try and a front page perhaps

                            they should keep you busy until the Exynos 5 quad/Octo core arrives at least...
                            Last edited by popper; 12-09-2012, 04:18 PM.

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