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megafenix on 29 November 2013
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hsrob said:

I don't know much about this stuff but does the 87% efficiency mean it has to always be drawing that percentage of the power supply's total wattage or it has to be capable of doing so. i.e. does that mean it is always using 63 watts or can it be less.

Also in your breakdown towards the end where you are trying to calculate the GPU power draw, you didn't factor in the EDRAM. Now again I know nothing about this stuff but having seen the die shots of the GPU i would have thought that a big hunk of silicon like that would have to be responsible for a decent amount of that 'missing' wattage. (as a side note, early games not using all CPU cores or the EDRAM may help to account for the initial lower measurements of power draw)

Nonetheless, this is still interesting since most arguments revolving around analysis of the WiiU's GPU and likely power seem to inevitably fall back on, "but it only uses 33 watts, there's only so much you can do with 33 watts".


it means more or equal to 63.5 watts, but cant be less than that or nintendo would be violating the standards of DOE and of course they could sue  them or something

edram doesnt change things much, it only consumes some miliwats, for example, look at the ibm edram at 45nm

http://www-03.ibm.com/press/us/en/pressrelease/21074.wss

 

"

eDRAM Specifications 

Among the specifications of IBM’s high-performance eDRAM technology:

cell size: 0.126 mm2

Power supply: 1 V

availability: 98.7%

Tile: 1K RowX16 Col X146 (2Mb)

AC power: 76 mW

standby keep alive Power: 42 mW

Random cycle time: 2ns

Latency: 1.5ns

"

 

the e6760 performance is just an example, we could at least expect this kind of performance from nintendo since they are not payiong AMD research development for nothing, but still, we could also consider 13.3 gigaflops per watt like the redwood pro

 

for thewayofthepath

true, but knowing nintendo i dont see them throwing watts for nothing, obviously they want to squeeze as much as possible. at must maybe they could waste 5 watts, but dont forget that the standard says more or equal to 87%, not that is 87%, which means that efficiency could even reach 90%, 95% is possible but expensive, then again would explain why the wii u is expensive too