Pick the fasted ARM SoC GPU you know of then compare that to a Radeon HD 6310. What's your conclusion?
Fastest GPUs in ARM SoCs out today is irrelevant, because you're comparing against an SoC that isn't out in devices. Furthermore, since you only said "Cortex-A15 system" we can be free to pick any SoC that's ever released with a Cortex-A15, no matter how far into the future. Neither of us can say how weak or how powerful the best one will be, but since ARM IP is deployed by a wide variety of manufacturers you'll get some with a stronger emphasis on GPU capabilities than others.
You've been ignoring the fact that I'm talking about system performance.
No, I've been pointing out over and over again that it doesn't make any sense..
Well, in the HTML5 Fishbowl demo, Clovertrail was only showing 1 fish at 30fps whereas Temash was showing 80 at 60fps undocked.
So what? Is that your way of claiming Clover Trail is 160 times faster? You know that's not a correct interpretation right? All you can say for sure is that Temash was at least 2x faster (which is of course no big accomplishment). If you want a real GPU benchmark you have to have the same load on both units.
the Exynos 5 Dual can go up to 8W and needs to throttle the CPU down to 800MHz to keep it under 4W at load. How do you think an 800MHz A15 will compare with Temash now?
Yeah, if you run both CPU cores and GPU at full speed, which is rarely what a game will actually want. It's also just one particular Cortex-A15 SoC with one particular GPU and one particular set of thermal limits. The Temash you compare against isn't 4W TDP (it's 5.9W) and we can already infer that Tegra 4 in Shield isn't going to be thermally limited to 4W either, on account of battery life figures suggesting a system total of 8W, and the thing being packed with a fairly heavy fan and heatsink.
Samsung probably had a reason to switch back to IMG for Exynos 5 Octa, and perf/W of the GPU may well have something to do with that. But you can't blame the CPU for that.
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