User:Zodon/draft2

Computer

SSD

Comparison to hard disks - perhaps combine some items out of the advantages/disadvantages format. e.g.

• Weight and size: hard disks can store more data per unit volume than DRAM or flash SSDs, except for very low capacity/small devices. Low-capacity SSDs have lower weight and size, but size and weight per unit storage are still better for traditional hard drives, and microdrives allow up to 20 GB storage in a CompactFlash 42.8×36.4×5 mm (1.7×1.4×.2 in) form-factor. Up to 256 GB, flash SSDs are currently lighter than 2.5inch hard drives of the same capacity.

Power consumption, likewise.

Quiet

• Quiet PC

Solid state drive

Green

• Green computing

[1] Importance of low power in high performance computing. - Might use as ref in Green computing, or in Performance per watt, also delves into DVFS.

Items somebody removed from see also in green computing - check for merit:

• Ars System Guide special: it's easy being green - Ars Technica

• Top 10 Computing Energy Savers - Lifehacker

• Saving Power on idle PCs - CalTech

• Green Computing Guide - University of Colorado, Boulder

Public computers and information resources located at a library, internet cafe or telecenter.

• • Wake on LAN, wake on timer

Power over Ethernet - remote on/off X10

• Standby power - cleanup after merging in Phantom load.
  • Phantom load - merge into standby power
  • Sleep mode merge most of it into standby power

Minimalism (computing) - may have a place in green c. Software bloat

Interesting snippet from an article that probably got the axe:

According to the U.S. Environmental Protection Agency (EPA) data centers in the US use more power than all the televisions in the country and this is expected to double over the next four years. Servers and data centers today consume almost twice the amount of electricity they did in 2000. These figures show a pressing need for companies to work together to reduce the consumption of technology products today.

References

EPA Report to Congress on Data Center and Server Energy Efficiency, April 23, 2007

External Links

Green Computing Impact Organization, Inc. (GCIO) [2]

EPA Report to Congress [3]

Frequency and voltage scaling

• Power management

• Low-power electronics - more comprehensible explanation of a bunch of this than several of the others.

Duplicates a bunch of the material in some of the other energy saving/etc. articles.

• Voltage and frequency scaling yet another article on this

Frequency

These also might be merged into it

• Frequency scaling
  • Underclock
  • Dynamic frequency scaling

Merge Dynamic freq. and freq. scaling, merge into frequency and voltage scaling. Underclock probably also.

• • Overclock - probably big enough to leave separate).

Voltage

• Should CPU core voltage subsume the others?

(Related, but may apply to other than CPU)

• Voltage scaling
  • overvolting
  • undervolting
  • Dynamic voltage scaling - again, somewhat overlap with Undervolt. (Not so much with overvolt, though that may not be fundamental.)

Also dual-voltage CPU

There is proposal to merge overvolt, undervolt into dynamic voltage scaling. Overlap not complete - suggest move to

 voltage scaling, (with dynamic voltage scaling being a redirect).  
 Then undervolt and overvolt would fit within scope.

Clock

Clean your clock: Clock signal Should be merged: - bunch of small articles, each with just a bit of the picture (or more coherent overview to link them).

• Clock generator

• Clock rate
  • Megahertz Myth - merge?

Maybe this all should be merged into clock signal also. (Would be improved by a reference to actually show if this is a multiplier, or misnomer.)

• • Clock multiplier
    • CPU locking should probably also merge (and needs better redirects

CPU clock ratio locking, clock multiplier locking, etc.)

• • • Clock doubling - merged into above

Side note - digital circuits it is hard to get down to an explanation of what it means (it is there, just have to dig through several levels and it is buried). A synchronous circuit is a digital circuit in .... Digital circuit takes you to digital electronics, which says: Digital electronics are electronics systems that use digital signals. Digital signals says: "The term digital signal is used to refer to more than one concept. It can refer to discrete-time signals that are digitized, or to the waveform signals in a digital system." And finally digital takes you to a useful definition.

Performance per watt

Main article: Performance per watt

Created from FLOPS per watt

• Redirects
  • instructions per watt, MIPS/watt, MIPJ, MIPSPW, MIPW-S - redirect to above

• • Processing power fixed to instr/sec. (power maybe go to disambiguation performance per watt or instructions per second or FLOPS)

• Examples:

CDC 6600 3 MFLOPS ?? power

• • Instructions per second

• • • Instructions Per Cycle maybe should be merged with
    • Cycles Per Instruction

• Efficient energy use - should link to Performance per watt (now in see also)

• CPU power dissipation - mostly big catalog of numbers, explanation of causes lacking,

especially clock rate, voltage (some coverage in under/over clock/volt articles).