Tegra 3 uses processor scaling, meaning it uses 1,2,3, and all 4 cores only as needed and turns off the cores when not being used.  While a 5th low power core is used for low performance tasks.  So power efficiency claim is more a matter of average than peak performance power efficiency for comparing to the Tegra 2.

Cortex A15 though is suppose to be up to 40% more energy efficient than Cortex A9.  Add the demo was with a 800MHz (A15) vs 1.3GHz (A9) means it’s a pretty safe bet it was using less power.  Especially since power efficiency tends to get a little worse the closer the clock speed is to the chip’s maximum.

If it was the Tegra 3 then it was running at full throttle.  Since normally when only using a few cores the clock speed goes up to 1.4GHz, but when all 4 cores are being used then it drops to 1.3GHz.

Btw, to Charbax, remember Nvidia is coming out with Grey for a solution with integrated 3G/4G for more specialized embedded solutions.  Along with Wayne, which may or may not come out on schedule but will eventually be offered in both quad and octo core configurations.

 Tegra 3 uses processor scaling, meaning it uses 1,2,3, and all 4 cores only as needed and turns off the cores when not being used.  While a 5th low power core is used for low performance tasks.  So power efficiency claim is more a matter of average than peak performance power efficiency for comparing to the Tegra 2.

Cortex A15 though is suppose to be up to 40% more energy efficient than Cortex A9.  Add the demo was with a 800MHz (A15) vs 1.3GHz (A9) means it’s a pretty safe bet it was using less power.  Especially since power efficiency tends to get a little worse the closer the clock speed is to the chip’s maximum.

If it was the Tegra 3 then it was running at full throttle.  Since normally when only using a few cores the clock speed goes up to 1.4GHz, but when all 4 cores are being used then it drops to 1.3GHz.

Btw, to Charbax, remember Nvidia is coming out with Grey for a solution with integrated 3G/4G for more specialized embedded solutions.  Along with Wayne, which may or may not come out on schedule but will eventually be offered in both quad and octo core configurations.

The chip supports two LPDDR2 or DDR3 interfaces running up to 400 MHz for a total memory bandwidth of up to 6.4 Gbytes/s”

sounds like the Exynos 4412 quad at 1.5-1.8 GHz but thats said to also have the ARM Mali-T604 not T400 and its assumed by the so called pro hardware sites we wont see the Mali-T604 or the Exynos 5450 quad Mali-T658 till very late Q4 at best

So should probably ask if they plan on having anything to compete with the Tegra 4 and not just the Tegra 3 for a better long term picture.

Also ask how do they expect their Cortex M4’s will compare to the A7 that’ll be coupled with other Cortex A15 solutions for power efficiency and performance?

C.O robclark http://phoronix.com/forums/showthread.php?68891-There-s-Hope-For-DMA-BUF-With-Non-GPL-Drivers/page2

Still, this brings promise for when i eventually retire my new purchase.