There are huge numbers of myths about Power-Supply and its features. Every single week, new models of Power-Supply come out with features never heard-off but also eye-catching at the same time. Mind bobbling wattage value, many rails, modular, SLI/CrossFire certified etc. But whats the real fact within them ?

Before I start, do remember, Power-Supply is equally important in choosing the right Processor+Motherboard combination. So, choose wisely.

Does a Power-Supply upgrade means a Higher Electric Bill ?

This is the biggest myth of all.
First, it's important to understand that a power supply only delivers the power that's needed by the system, nothing more. If your PC currently has a 400W supply and the system needs 350W, it will still need and use only 350W - if the only change is upgrading to a 500W power supply (the upgrade makes sense since there are many advantages to running a power supply at a lower percentage of its rated capacity). Whether the electric bill goes up or down is solely determined by the efficiency of the new power supply. Greater efficiency means a lower electric bill because more of the AC power is converted into DC for the computer, rather than wasted as heat. The savings can really add up over time.

Don't be misled by Exaggerated Wattage claims.

To properly compare power supplies, wattage claims must state the maximum ambient temperature for continuous, full-load operation. Unfortunately for the consumer, this information is usually withheld, opening the door for manufacturers to exaggerate their wattage claims. They do so by assuming an unrealistic ambient temp of only 25°C (77°F), even though the actual internal power supply temp is at least 40°C (104°F). Since the proper full-load rating is 15°C higher for home use and 25°C higher for industrial use, these power supplies produce 33%-50% less power than their advertised ratings.

Also some brands overwrite the wattage value than the value mention by the very own OEM company that actually builds the SMPS/PSU for them !!

Example: Truth about: Cooler Master eXtreme Power 600W  

Don't loose Power with Modular Plugs.

Due to their look, convenience, cost savings for manufacturers and for lesser cable management inside a PC, modular plugs have become a popular power supply feature. Unfortunately, there has been little or no discussion of the impact of this feature on overall performance and reliability. The fact is, modular plugs limit power by adding to electrical resistance. The voltage drop can be as much as would occur in 2 feet of standard wire. Worse yet, modular plugs utilize delicate pins that can easily loosen, corrode, and burn, creating the potential for a major system failure. That's why professional system builders specify uninterrupted wire !

An SLI-Certified Power-Supply will always power High-End Graphics Cards ?

We went through three power supplies before we found one that consistently worked with these high-end graphics cards and an FX-60. We initially started with a Silverstone 600W SLI certified power supply, but running some games resulted in the system powering down under full load. We next moved onto a higher rated Thermaltake PurePower SLI certified 680W unit. But while most games ran most of the time, the system would still occasionally shut down.

ExtremeTech Review Feb 12, 2006  

Are Multiple 12-volt Rails Better then a Single 12-volt Rail ?

With all the hype about multiple 12-volt rails (ads claim that two rails is better than one, five is better than four, etc.), you'd think it was a better design. Unfortunately, it's not !

Here are the facts: A large, single 12-volt rail (without a 240VA limit) can transfer 100% of the 12-volt output from the PSU to the computer, while a multi-rail 12-volt design has distribution losses of up to 30% of the power supply's rating. Those losses occur because power literally gets "trapped" on under-utilized rails. For example, if the 12-volt rail that powers the CPU is rated for 17 amps and the CPU only uses 7A, the remaining 10A is unusable, since it is isolated from the rest of the system.

Since the maximum current from any one 12-volt rail of a multiple-rail PSU is limited to 20 amps (240VA / 12 volts = 20 amps), PCs with high-performance components that draw over 20 amps from the same rail are subject to over-current shutdowns. With power requirements for multiple processors and graphics cards continuing to grow, the multiple-rail design, with its 240VA limit per rail, is basically obsolete.

Should an ATX Power-Supply be Cooled with a 120mm FAN ?

Most low-noise ATX power supplies today utilize a top-mounted 120mm fan rather than a rear-mounted 80mm fan. The 120's favorable reputation is based on the fact that under low to medium load conditions, the 120mm fan provides sufficient cooling at low RPM and low RPM fans are generally very quiet.

However, problems occur with this design when the load exceeds 50%-60%. Because the 120mm fan consumes about 1.5" of vertical space inside the PSU, heat sinks, capacitors, and other components are about 30% smaller in height compared to a PSU with a rear-mounted fan. The smaller parts can handle less current, so the maximum power available with the 120mm design is limited. And, because the heat sinks have less surface area, more air flow is needed with this design to keep the thermal situation under control. With 80%-100% load, the 120's fan speed can double and the noise level can jump by up to 20dB.

In conclusion, for systems that require more than 50% of the power supply's capacity, a well-engineered PSU with a rear-mounted 80mm fan will provide superior performance and reliability (due to larger components) at a noise level comparable to a PSU equipped with a 120mm fan.

Are Two Power-Supply Fans Better than One ?

No. A power supply with two fans doesn't exhaust any more air from the case than a power supply with one. That's because due to space limitations, only one fan can be used for exhaust, while the other is limited to spot cooling. Possible explanations for a 2-fan PSU include: thermal engineering problems; an attempt to exaggerate the wattage rating by spot cooling the transformer; or an attempt by the marketing department to create a new gimmick.  

Hope this article will help you in choosing the right Power-Supply for your need.

http://www.jonnyguru.com/PSU/eXtremePower600W/

http://www.gigahertz.net.in/images/topics/cm600w_pcb.jpg 

Acer
Company:- Acer
Contact:- 022-56976999
Email:-
Web:- Welcome to Acer India (Pvt) Ltd.
OR
Company:- Acer India Pvt Ltd
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Altec Lansing
Company:- Zeta Technologies
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Web:- india air gift to calling at zetaindia.com
OR
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AMD
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Web:- Advanced Micro Devices, AMD – Global Provider of Innovative Microprocessor Solutions
OR
- Contibuted By Puns
Advanced Micro Devices Far East Ltd
Suite 205, Chintels Business Centre, Chintels House A-11 Kailash Colony
New Delhi 110 048
Tel: 91 11 2623 8620 - 29 Fax:91 11 2646 4595

AMD Far East Ltd. (India)
No. 10, Chambers @Mantri Richmond Road Bangalore - 560 001
Tel: 91 80-5112-3540/1/2/3 Fax:91 80-5112-3544

Advanced Micro Devices Far East Ltd
Suite 604-B, 6th Floor, Sunteck Certainty Building No. C21, Housefin Bhawan
E Block, Bandra Kurla Complex Bandra (East) Mumbai 400 051
Tel: 91 22 2657 2473 Fax:91 22 2657 2090

Antec
Company:- Prime ABGB [Mr Gulbir Singh @ Mumbai]
Contact:- 022-2896600 , 022-23855500
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Web:- AntecIndia

AOpen [XC Cube
Company:- Xserve India Pvt Ltd
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Apple
Company:- Apple India Ltd
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OR
- Contributed By puns
Banglore : [080]5550575
Mumbai : [022]26559721/22
New Delhi : [011]51638801/02

Artic [Cooling Solutions]
Company:- Prime ABGB
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Artis
Company:- Kunhar Peripherals
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ASUS
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ATI
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Belkin
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Benq
Company:- Benq India
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Buffalo [WiFi Products]
Company:- Buffalo Inc
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Compro [TV Tuners]
Main:- www.comprousa.com
Company:- MediaTech India
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Canon
Company:- Canon India Pvt Ltd
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Creative
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OR
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Corsair
Company:- Prime ABGB
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Web:- Corsair Memory - Home

Cyber Acoustics [Speakers]
Company:- Arc Max Technology
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Web:- ARC-MAX Technology Company- WEB CONSULTANTS, WEB DESIGNERS, WEB MARKETERS, PHP

Dell
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DFI - Design For Innovation


D-link
Company:- Dlink India
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DMS [for i-Cube]
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Freecom
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Fuji
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Fujitsu
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Gainward
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Gigabyte
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HCL
Company:- HCL Infosystems
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Hynix
Found anywhere dont have any fixed details
but finding hynix products is easy

Hewlett Packard
Company:- Hewlett Packard
Contact:- 1600 444 999
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Iomega
Company:- Neoteric Informatique
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Intel
Company:- SES Tech Ltd
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Kingston
Main:- Kingston Technology Company - Homepage - Where To Go To Find Memory
Company:- AAInfoways
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OR
Company:- Sigma Solutions
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OR
Company:- PC Wagon
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OR
Company:- Prime ABGB
Contact:- 022-23828100
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Web:- Kingston Technology Company - Homepage - Where To Go To Find Memory
OR
- Contributed By puns
A.A. Infoways Pvt. Ltd.
209, Bhandari House,
91, Nehru Place, New Delhi - 110 019.
Phone : +91 11 26442261
Fax : +91 11 26442262

LeadTek
Company:- Meganet
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Company:- Zebronics
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Lexmark
Company:- Lexmark India Pvt Ltd
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Liteon
Company:- MediaTech India
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Logitech
Company:- Rashi Peripherals
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OR
Company:- Logitech Electronics India Pvt Ltd
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LG
Company:- LG Electronics India
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Web:- LGe-Shoppe

Maxtor
Company:- Ingram Micro India
Contact:- 080-5550605
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Microsoft
[You will easily get microsoft products anywhere]
Company:- Microsoft India
Contact:- 011-6294600
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Mitashi
Company:- Mitashi Edutainment Pvt Ltd
Contact:- 022-25006661
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MSI - Micro Star International
Main:- MSI -- MICRO-STAR INT'L CO.,LTD. , MSI - Innovation with Style
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Company:- Tirupati Enterprises
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Company:- Cyberstar India
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NEC
Company:- Shiba Comp Pvt Ltd
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Net Gear
Company:- Hallmark Systems
Contact:- 022-26841346
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Web:- NETGEAR - Wireless routers, adapters, and other networking solutions for the home, smb, and broadservice Providers

Nikon
Company:- Prerna Enterprise
Contact:- 022-22695464/65/66
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Web:- Nikon Global Gateway , Nikon Digital Website

Nokia
Company:- Nokia India Ltd
Contact:- 011-26779000
Web:- Nokia - Mainpage

O2
Company:- Creative E-Biz.Com Ltd
Contact:- 011-51619800
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Web:- O2

OCZ
Some shop in Banglore sells it.
Newegg.com - Buy Computer Parts, PC Components, Laptop Computers, Digital Cameras and more!

Palm
Company:- Tech Pacific India Ltd
Contact:- 022-55960360
Email:- Not Known
Web:- Welcome to Palm, Inc., formerly palmOne - Select a Destination

Philips [Speakers]
Company:- Neoteric Informatique
Contact:- 022-39828600
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Web:- www.neoteric-info.net:8080/
OR
Company:- Philips India Ltd
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Pinnacle
Company:- Aditya Infotech Ltd
Contact:- 9810523364[New Delhi] , 9892335088 [Mubai], 9342816430[Banglore] , 9841019680[Chennai]
Email:- This email address is being protected from spambots. You need JavaScript enabled to view it.
Web:- Welcome to Pinnacle Singapore - Home video editing, watch TV, DVD authoring

Pixel View [TV Tuners]
Company:- Rashi Peripherals
Contact:- 022-28221013
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Plextor
Company:- Zeta Technologies
Contact:- 022-24182288
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Web:- w ww.zetaindia.com

Power Safe
Company:- Kunhar Peripherals
Contact:- 022-56345758
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Web:- Kunhar Peripherals Pvt Ltd

Senao [WiFi Products]
Company:- Multilink Computers Pvt Ltd
Contact:- 011-26488877
Email:- Not Known
Web:- SENAO International CO., LTD product/product_wireless01_all.asp

Samsung
[This is also available easily everywhere]
Company:- Samsung Electronics India
Contact:- 011-51511234
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Web:- SAMSUNG's Digital World

Segate
Company:- Fortune Marketing Pvt Ltd
Contact:- 011-26427627 , 080-51133626 , 044-28555449
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Web:- segate.com

Shuttle PC
Company:- MediaTech India
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Web:- Welcome to Mediatech India

Sony
Company:- Rashi Peripherals
Contact:- 022-28221013
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Web:- www.rptechindia.com

Sunon Group [Fans & cooling]
Website : SUNON

Distributors:
Arihant Electricals
Contact Person: Mr. Rajesh Kumar
Address: 24/4866 Ansari Road, Darya Ganj, New Delhi 110002
TEL: ( 91) 11 - 326 2176
FAX: ( 91) 11 - 327 3554
E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.
Web:Arihant Electricals, world class semiconductors power and Electronic Components for Industrial and consumer electronics applications eg MOTOR Drives, Welding Machines, Inductive heating, UPS, SMPS, Inverters, Lamp Ballast, Micro Wave Ovens, Low Noise

Network Electronics
Contact Person: Mr. Chandresh Shah
Address: 52B/4H, Chotani Building, 1st Floor, Proctor Road, Grant Road (E), Mumbai 400007.
TEL: ( 91) 22 - 387 4947
FAX: ( 91) 22 - 387 0763
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Web:Network Electronics ASA

Amar Radio Corporation
Contact Person: Mr. Amar Chawla
Address: 134-138 Sadarpatrappa Road,Bangalore, 560002
TEL: ( 91) 80 - 227 5263
FAX: ( 91) 80 - 221 8520
E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.

Thermal Take
Company:- Prime ABGB [Mr Gulbir Singh @ Mumbai]
Contact:- 022-2896600 , 022-23855500
Email:- This email address is being protected from spambots. You need JavaScript enabled to view it.
Web:- Welcome to Thermaltake

Transcend
Company:- Prime ABGB [Mr Gulbir Singh @ Mumbai]
Contact:- 022-2896600 , 022-23855500
Email:- This email address is being protected from spambots. You need JavaScript enabled to view it.
Web:- Welcome to Transcend website - Standard Memory,Flash Card,USB Flash Drive,Portable HDD,Multimedia Products,Accessories,Proprietary Memory ,T.sonic Series
OR
Company:- Wales Technologies
Contact:- 022-223828100
Email:- Not Known
Web:- Welcome to Transcend website - Standard Memory,Flash Card,USB Flash Drive,Portable HDD,Multimedia Products,Accessories,Proprietary Memory ,T.sonic Series

Toshiba
Company:- HCL Infosystems [For Laptops]
Contact:- 0921339260[Mumbai] , 9810889196[New Delhi] ,044-24335249
Email:- This email address is being protected from spambots. You need JavaScript enabled to view it. , This email address is being protected from spambots. You need JavaScript enabled to view it.
Web:- Toshiba :: Asia
OR
Company:- Esource Global [For PDA]
Contact:- 022-26732929
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Web:- Toshiba America, Inc.

Typhoon [Speakers]
Company:- Aditya Group
Contact:- 011-26223810
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Web:- Typhoon - Multimedia for living

ViewSonic
Company:- Roop Technologies Pvt Ltd
Contact:- 022-26680022
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Web:- ViewSonic - The Choice of Professionals

Western Digital
Company:- Western Digital
Contact:- 022-30936050
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Web:- Western Digital Hard Drives

XFX
[Available easily @ Lamington Road , Mumbai]
Company:- Big-Byte India
Contact:- 022-23894800
Email:- This email address is being protected from spambots. You need JavaScript enabled to view it.
Web:- www.xfxforce.com

Zebronics [Cabinet]
Company:- Topnotch Infotronics Ind Pvt Ltd
Contact:- 044-26616201
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Web:- www.zebronics.com

Zenith
Company:- Zenith Computers Ltd
Contact:- 022-28377300
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Web:- Zenith Computers - Best known PC brand in India - exporting to Asia,South Africa,Iran,Jordon,Saudi Arabia,Maldives,UAE