Official XS Tiered PSU Manufacturer Brand Listing Phase III

All credit goes to: http://www.xtremesystems.org/forums/showthread.php?t=108088

As with any guide there may be psu's that aren't listed, or you may have your own opinions on various units. However you can visit SilentPCReview, PCPer, and jonnyGURU for in-depth psu reviews.

WHICH ONES TO BUY ??

Tier 1 can handle 4Ghz Conroe or 3Ghz AMD along with Oced Quad Crossfire/SLI With Ease.
Tier Z offers quality and power unequalled in its wattage range and is second only to other Zippy units.
Tier 2 offers almost as much power and stability as Tier 1 at Comparable Wattage levels with lower price/better availability.
Tier T offers the high quality components of Tier 2 with slightly less Rail stability due to Topower internals.
Tier 3 is ONLY Recommended if Price difference is present between Tier 3 and Tier 2 or due to availability issues with Tier 1/2 PSUs.
Tier 4 is recommended for stock or low power systems if Tier 3's are more expensive or are not available.
Tier 5 are NOT RECOMMENDED, but some brands have high/medium quality components in Tiers 2 through 4.

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Tier 1 Brands - The Most Powerful And Stable Components On The Market
Enermax Galaxy
PCP&C TurboCool
PCP&C Silencer >610
Zippy/Emacs SSL
Zippy/Emacs GSM
Zippy/Emacs PSL
Silverstone ZF (Etasis 85/75/56)
Seventeam ST >600 (SSI, V2.91)
Silverstone OP/DA >700W

Tier Z - Less Powerful Than Tier 1 Zippy Units...but they're still Zippys
Zippy/Emacs HG2
Zippy/Emacs HP2

Tier 2 Brands - Top Quality components With Top Notch Stability - For Those With Price/Availability Issues With Tier 1
Antec Neo HE
Antec EarthWatts
Antec TruePower Trio
Akasa PowerGreen 80+
CoolMax CTG-750W/850W/1KW
Cooltek CT
Corsair HX
Corsair VX
Enermax Liberty
Enermax Infiniti
Enhance ENP-GH
Fortron (FSP) GLN
Hiper Type-M >650W
Hiper Type-R >650W
iStarUSA PD2
iStarUSA PD3
OCZ GameXStream
OCZ EvoStream
PCP&C Silencer <610
Seasonic S12
Seasonic M12
Seasonic Energy Plus
SevenTeam ST <600
Silverstone EF
Silverstone OP/DA <700W
Supermicro/AbleCom
Thermaltake Toughpower >600W
Xclio GreatPower
Xclio StablePower
Zalman ZM
Ultra X3
Ultra X-Pro

Tier T - High Quality PSUs Made With Topower Internals - Less Rail Stability Compared To Tier 2 But Still Better than Tier 3
Mushkin Enhanced
Tagan U95
Tagan U25
Tagan U15
Tagan U22
OCZ PowerStream

Tier 3 Brands - High Quality and Stability, Second Only To Tier 2 Brands
Acbel Polycom
AMS Mercury
Akasa PaxPower
Akasa PowerPlus (>500W Models)
Antec Phantom
Antec TruePower III
Antec TruePower II
Antec TrueControl II
Antec NeoPower 480W (Old Model)
Antec SmartPower 2.0
Athena Power Space Shuttle Series
Be Quiet Dark Power Pro
Channel Well
Enermax Maximum Plus
Enermax Noistaker II
Enermax Noisetaker
Enermax Whisper II
Enermax CoolerGiant
Enhance ENS-G
Epower Xscale
Fortron (FSP) GLC
Fortron (FSP) THN
Fortron AX
Fortron HLN
Fortron PFN/PN/PA
Seasonic Super Versatile
Silverstone F
Sparkle FSP
Spire Rocketeer V/VI
Sunbeam Nuuo
Thermaltake Purepower
Thermaltake Toughpower <600W

Tier 4 - Not Recommend With Tier 3 In same Price/Wattage Range
Aerocool
Asus Atlas
BFG
Coolermaster Real Power
Coolermaster iGreen
Delta
Enlight
E-Power
Futurepower
Hiper
HIPRO
Lite-On
Masscool
MGE XG
Mushkin HP
NorthQ 4775-500S/BU
OCZ Modstream
Scythe Kamariki
Sintek
Thermaltake TR2
TTGI/Superflower
Ultra Xfinity/X2

Tier 5 - Other than the units listed above for any of these brands, NOT RECOMMENDED
A-TOP Technology
APEX (SUPERCASE/ALLIED)
Aspire(Turbo Case)
ATADC
Athena Power
ATRIX
Broadway Com Corp
Cooler Master
Coolmax
Deer
Diablotek
Dynapower USA
EagleTech
FOXCONN
I-Star Computer Co. Ltd
In Win
JPAC COMPUTER
Just PC
Kingwin Inc.
Linkworld Electronics
Logisys Computer
MGE
MSI
NMEDIAPC
Norwood Micro/ CompUSA
NorthQ
NZXT
Powmax
Q-Tec
Raidmax
Rosewill
SFC
Shuttle
Skyhawk
Spire Coolers
Star Micro
STARTECH
TOPOWER TOP
Ultra X-Connect
Wintech 
XION
YoungYear
Zebronics

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Phase III compensates for overcrowded Tier 1, while clumping together previously Tier 2 and 3 PSUs if only because no definite way to categorize then as good enough for Tier 2 or bad enough for Tier 3.

PSU Calculators

• eXtreme Power Supply Calculator Lite v2.5 - Endorsed by Antec
  
  The recommended total Power Supply Wattage gives you a general idea on what to look for BUT it is NOT a crucial factor in power supply selection! Total Amperage Available on the +12V Rail(s) is the most important, followed by the +5V amperage and then the +3.3V amperage.
  
  

• Overclockers.com.au (Australia) PSU calculator
  
  This can calculate both the wattage and 12V amps required to run your system. Data is based off measured values from any accurate manufacturer supplied data and the following sources: Digit-Life, LostCircuits, SilentPCReview, StorageReview, TechReport, XbitLabs
  

* This thread is not endorsed by Newegg or its affiliates.

If you are going to buy a $300+ video card you shouldn't ask if you can run it on a $50 power supply.

Plain and simple

Here's a link to some more work done by Elite Killer regarding power supply efficiency

PSU utilization myths debunked!

And a great article from Howstuffworks.com

Power Supply Essentials 

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I fold for my Grandmothers, my cousin Mike, Uncles Bob and Carl, Aunt Barb, my wife's Grandmother, Aunts Linnea and Alma and Uncle Myrel who all died from Cancer and my dad who has survived