2013 core sizes: A7-A15-Jaguar-Atom-Haswell

[Exophase]

Originally Posted by IntelUser2000

The real question is how much power the non-core functions consume. Looks like at 1.2GHz the Exynos is using close to 3W for the core, while the 5.9W TDP for Jaguar is basically max power.

Where are you getting that from? And what do you mean by core? The CPUs? It's pretty much 3W for max for both CPU cores at 1.7GHz. Whatever the GPU uses under any circumstances has nothing to do with this.

[IntelUser2000]

Originally Posted by Exophase

Where are you getting that from? And what do you mean by core? The CPUs? It's pretty much 3W for max for both CPU cores at 1.7GHz. Whatever the GPU uses under any circumstances has nothing to do with this.

I'm talking about 3W for the quad core Exynos(Exynos Octa) running at 1.2GHz, since you mentioned that frequency.

Actually, I did pixel counting in paint and got 2.6W at 1.2GHz(16800MIPS).

Anyways, the Clover Trail system I have does not have the sensors for the CPU but the Ivy Bridge Ultrabook does. Some interesting results here.

At 2.8GHz frequency:

-55200MIPS in Dhrystone
-14.2W max package power, 12W core power for a certain duration(my system has the CPU set at 15W), with 12.5W package power, 10.2W core power for remainder of the benchmark

At 800MHz LFM locked:

-15500MIPS
-5W package power, 2.8xW core power for a certain duration, with 4.5W package power and 2.4xW core power for the remainder of the time

(The GPU power use is insignificant at 2-10mW and the non-core functions vary little at 2-2.3W)

I also find it interesting how little it uses at 800MHz. 5W package power in Dhrystone probably means if its capped at that frequency, 7W SDP is realistic even under load(but SDP is for another topic). Also the little variation of non-core power(package power - core power - gpu power) means it doesn't really do much of power management and puts an absolute ceiling on how low they can go with TDP.

[Exophase]

Originally Posted by IntelUser2000

I'm talking about 3W for the quad core Exynos(Exynos Octa) running at 1.2GHz, since you mentioned that frequency.

Actually, I did pixel counting in paint and got 2.6W at 1.2GHz(16800MIPS).

Right, 2.6W for 4 cores at 1.2GHz, or < 0.7W per core. It remains to be seen if that's really what you get, but that's not really bad at all. I really doubt Temash will actually use < 3W for the CPU cores at 1GHz. I know that it has other stuff on the SoC. But if the TDP is nearly 6W yet it can't even allocate half of that to the CPU when the GPU is barely doing anything then its turbo is doing a poor job or it doesn't have turbo at all except for when the docking station says it's okay.

Originally Posted by IntelUser2000

Anyways, the Clover Trail system I have does not have the sensors for the CPU but the Ivy Bridge Ultrabook does. Some interesting results here.

At 2.8GHz frequency:

-55200MIPS in Dhrystone
-14.2W max package power, 12W core power for a certain duration(my system has the CPU set at 15W), with 12.5W package power, 10.2W core power for remainder of the benchmark

At 800MHz LFM locked:

-15500MIPS
-5W package power, 2.8xW core power for a certain duration, with 4.5W package power and 2.4xW core power for the remainder of the time

(The GPU power use is insignificant at 2-10mW and the non-core functions vary little at 2-2.3W)

I also find it interesting how little it uses at 800MHz. 5W package power in Dhrystone probably means if its capped at that frequency, 7W SDP is realistic even under load.

Just going to ignore the DMIPS stuff, it's a useless awful benchmark

So you're saying at 800MHz the two cores (both were active right?) only used 2.4-2.8W, but the whole package used 4.5W - and most of that wasn't GPU? Then what on earth was it? I don't think the memory controller should be using anywhere close to that, nor L3..

[IntelUser2000]

Originally Posted by Exophase

Just going to ignore the DMIPS stuff, it's a useless awful benchmark

So you're saying at 800MHz the two cores (both were active right?) only used 2.4-2.8W, but the whole package used 4.5W - and most of that wasn't GPU? Then what on earth was it? I don't think the memory controller should be using anywhere close to that, nor L3..

The whole point of using DMIPS is because Samsung used it. It also proves that there are high load applications that does not load it to TDP.

Also, yes, the uncore functions can use that much power. Because that's what the Datasheet for Ivy Bridge chip says it as well. For Package C7, its rated at 2.2W for the 17W chips. But it seems its basically fixed regardless of frequency or load!

[Exophase]

Just because Samsung used it doesn't mean it's useful for anything beyond trying to determine the frequency at the respective points. No matter what you think of a product nothing really justifies using DMIPS for marketing. Sadly a lot of companies still do it.

I'd argue that it doesn't necessarily even constitute as good representation of full CPU load, even if it uses 100% CPU time, because it doesn't cache miss at all. A normal application will be running the prefetchers hard but this one will barely touch them.

[IntelUser2000]

Originally Posted by Exophase

Just because Samsung used it doesn't mean it's useful for anything beyond trying to determine the frequency at the respective points. No matter what you think of a product nothing really justifies using DMIPS for marketing. Sadly a lot of companies still do it.

I'd argue that it doesn't necessarily even constitute as good representation of full CPU load, even if it uses 100% CPU time, because it doesn't cache miss at all. A normal application will be running the prefetchers hard but this one will barely touch them.

That applies same to the flash heavy browsing you are talking about. Those usage scenarios with sporadic demand doesn't let it go to TDP.

I'd also argue in Whetstone(FP) its where it reaches the higher point of the power usage as in my data, with lower one being reached by Dhrystone.