DrPop
03-18-14, 04:51 PM
Anybody ever done a calculation for credits / watt on these little android devices? I've got POGs running now on an old Motorola Atrix 4G (MB 860) that Zombie convinced me to crunch with. ;) I'm just curious what the efficiency might be of the ARM chips inside these things compared to our Intel / AMD hogs. BOINC says it's an ARMV7 rev 0 (v7l), which I have found out is the instruction set.
Specs sheets on 'Net tell me the Atrix 4G has the Nvidia Tegra2 (Dual Cortex A9) inside. I can find all kinds of info except the wattage. Best guess?
Looks like I'm getting 0.0066 credits per second on this thing. I wonder how many watts it's sucking down?
My i7 gets 0.026 credits per second. That's 4x the credits per second per WU, and the i7 crunches on 8 of those WUs every second of course. So (for sake of easy academics) let's say the i7 burns 96W to do 32X the work as the ARM CPU (4 x 8).
This means the Intel i7 Sandy Bridge would burn 3W for every equivalent crunched WU of the ARM CPU. hmmm... so it's definitely a possibility, that if the Tegra 2 CPU is using less than 3W, it is actually more efficient to crunch with than an i7! :p And I read somewhere the Tegra 4 is considerably more efficient than this old Tegra 2 in this example. Imagine that efficiency...but certainly not as effective as the i7 for building up the credits quickly. ;)
Specs sheets on 'Net tell me the Atrix 4G has the Nvidia Tegra2 (Dual Cortex A9) inside. I can find all kinds of info except the wattage. Best guess?
Looks like I'm getting 0.0066 credits per second on this thing. I wonder how many watts it's sucking down?
My i7 gets 0.026 credits per second. That's 4x the credits per second per WU, and the i7 crunches on 8 of those WUs every second of course. So (for sake of easy academics) let's say the i7 burns 96W to do 32X the work as the ARM CPU (4 x 8).
This means the Intel i7 Sandy Bridge would burn 3W for every equivalent crunched WU of the ARM CPU. hmmm... so it's definitely a possibility, that if the Tegra 2 CPU is using less than 3W, it is actually more efficient to crunch with than an i7! :p And I read somewhere the Tegra 4 is considerably more efficient than this old Tegra 2 in this example. Imagine that efficiency...but certainly not as effective as the i7 for building up the credits quickly. ;)