Samsung Galaxy A9 Arm 8 Processors 4GB RAM Android14
11 Feb 2025 17:52:47 UTC
Topic 232083
(moderation:
Boinc 8.0.2 on Android 14
When i use only 5 processors together, this thing gets not even warm, and computes a unit (BRP4 Arecibo) , in about 17.000 seconds. About 5 to 10 units per day. (10 hours per day)
When i use all 8 processors on this tablet, a unit can need up to 30.000 seconds. A modern PC, with a good GPU, cuts throu in 30 seconds. A thousand times faster! Unbelievable!
Which one is more energy efficient? I think it is the PC, even though it needs much more wattage, in use. (100 Watt to about 300 Watt)
When i calculate to do 300 units per month, with the tablet, i would say, this is only 2 Kilowatt hours per month. (rough estimate)
Of course, GPUs can
)
Of course, GPUs can outperform CPUs, potentially by a large margin if the algorithm is well-suited for highly parallel processing. Not all algorithms fit this criterion and there are some areas where a CPU could perform better.
Tablets aren’t designed for computing, they can run the same code, but their efficiency will never match that of specialized hardware. A 10W device may seem power-efficient, but if you need 100 devices to match the performance of what a single GPU can do, the efficiency quickly diminishes.
It's like comparing a Ferrari
)
It's like comparing a Ferrari to a van, both are vehicles that can take you from point A to point B, but they excel in different aspects. It's a trade-off.
Risky64 wrote: When i use
)
It is usually a bad idea to run all CPU cores with Boinc. Try 7 processors and you may see a general increase in total production.
A Proud member of the O.F.A. (Old Farts Association).
ahorek's team
)
It compares with raspberry pi, which has only 4 CPUs. Similar times. Here are many, who use a raspberry to compute those arecibo units.
I agree with you. I do this.
Raspberry Pis benefit from
)
Raspberry Pis benefit from active cooling, allowing them to reach their CPU's maximum clock speeds.
Tables rely on passive cooling, so even if the CPU can technically run at 3GHz (potentially the same model as in an RPI), its clock speed and performance must be limited to prevent overheating. Additionally, using more cores reduces thermal headroom, and the lower clock speeds may negate the performance benefits of utilizing multiple cores.
ahorek's team
)
Those cores are able to clock 2 Ghz and 2.2 Ghz. I can agree on this. More work, more heat, but when i crunch only three units together, there is no more heat than 28 degrees Celsius inside at the battery. (No external fan) Extreemly efficient.
The room has only 20 degrees C.
The bottlenec could be the memory, not the heat. Boinc will prevent temps over 40 C.
> Boinc will prevent temps
)
> Boinc will prevent temps over 40 C.
It's the battery temp. CPU temps under load are higher https://play.google.com/store/apps/details?id=com.cpuid.cpu_z&hl=en the limit when it starts throttling is around 80-100°C
but yeah, it depends on the device's design, power, cooling system, and ambient temperature...