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Author Topic: Is an 80% decrease in power consumption possibe when going from 110nm to 65nm?  (Read 3653 times)
Fuzzy
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February 04, 2013, 12:16:13 AM
 #21

EDIT: Looks like avalon falsified their real world numbers on their site, even after the fist machine was already in customers' hands. They updated them to "reflect customers' experience" to 620w for a 66Gh/s rig.

Given avalon's actual 9.4 W/Gh power consumption, I really doubt BFL can even accomplish 3 W/Gh, let alone 1.
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Puppet
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February 04, 2013, 10:52:30 AM
 #22

You might be right.
If power required for the greater frequency is the same, which I believe it's true at least for the dynamic power (1/2C*V^2*f + Qtransition*f), there is an efficiency increase. But you might be wright because at 65nm leakage power becomes comparable with dynamic power (unless you use LP process, which I doubt).  

Static power/leakage is almost certainly a non issue with bitcoin asics. Simply put, static power is the power consumed (leaked) by inactive circuits. On something as complex as a cpu, most circuits are inactive most of the time, even if the cpu is working under full load,  and maybe 90% of the dynamic power is consumed in like 5% of the CPU's transistors (numbers pulled out my behind). So leakage becomes a real issue, particularly when "idle".

But a bitcoin ASIC is not supposed to be idle and is incomparably simpler and all circuits are there specifically to be used while mining; so Im pretty sure 90+% of the circuits will be used pretty much all the time while mining. It really doesnt matter what the rest consumes when idle.
Bicknellski
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June 11, 2013, 05:03:52 AM
 #23

Numbers... who needs numbers.

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wrenchmonkey
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June 11, 2013, 05:48:43 AM
 #24

They see me trollin', they hatin'...

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Bicknellski
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June 11, 2013, 06:18:16 AM
 #25

EDIT: Looks like avalon falsified their real world numbers on their site, even after the fist machine was already in customers' hands. They updated them to "reflect customers' experience" to 620w for a 66Gh/s rig.

Given avalon's actual 9.4 W/Gh power consumption, I really doubt BFL can even accomplish 3 W/Gh, let alone 1.

What were the power numbers?

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