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PostPosted: Sun Sep 15, 2013 4:11 am 
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Anti-Static Strap
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Using the same (or very similar components, is there any power consumption difference between different motherboard chipsets?

Example: AMD 970 vs 990 vs 990FX.

Using the same processor and same number and types of drives and same chipset video card (apples vs apples) is there any lees draw with a 970 vs the step up 990 or 990FX? with no overclocking on processor or video card and running same O/S with the same power settings in the BIOS & the O/S.

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PostPosted: Sun Sep 15, 2013 10:46 am 
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Mobo-fu Master
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Depends on what features are active in the chipset. If a video port is part of the chipset, then power needs would be up to 3x higher than "base" needs.
From checking many data links, it appears the chipset in "base" status would draw around 20 watts max of +3.3 volts and +5 volts power. Example:
Today's chipset versions use less power than previous ones, due to the memory controller being on the CPU die.. not in the main or Northbridge chipset.
If more than four SATA plus six USB ports are part of the chipset design, then yes some extra power demands are there. But rarely will a chipset draw more than 25 watts of power, with today's designs. A massive heatsink with fan on the chipset gives away its power-hungry status!
The main power consumption for any design is the CPU itself. A single- or dual-core being the most frugal. With multi-core units that are not intended for mobile use, all cores typically stay near 100% activity. The mobile core design can switch active cores on and off rapidly, as needed.. conserving power.

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PostPosted: Sun Sep 15, 2013 4:59 pm 
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Anti-Static Strap
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Quote:
Depends on what features are active in the chipset.
Going on the assumption there is no on board video and the same functions/ports/devices are active, will power consumption at the outlet be the same?

Quote:
The mobile core design can switch active cores on and off rapidly, as needed.. conserving power.
PC chipsets with the same O/S do not have that ability?

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PostPosted: Mon Sep 16, 2013 2:27 am 
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Mobo-fu Master
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http://support.amd.com/us/ChipsetMother ... /48691.pdf

page 5-2, there is a difference in the TDP for each:
Quote:
RD990: 19.6
RD980: 14
RX980: 13.6


which suggest there will be a difference in power consumption for everyday use. There is no information whatsoever on how much that actually is worst case...

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PostPosted: Mon Sep 16, 2013 6:57 am 
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Quote:
PC chipsets with the same O/S do not have that ability?

Chipsets remain in a constant "on" state, but would require less power while there is no data flow. The processor by itself has several instruction sets to attain an idle or full operational state within microseconds. If the chipsets were to go into an "idle" state, communication links to devices may be lost, and it may take a minute or more to regain the links. Reference: When no data is being processed, the cores go into an almost immediate idle or stand-by state. When a command is initiated, the cores resume full activity. [simplified explanation].
Only the "mobile" processor class has this state of activity. The 'standard' processor would go into an idle state (lower power consumption) only after a set time of inactivity has expired, but not the very reduced power need state of a mobile processor.

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