[GUIDE] Power Supply Units for PC

StrikerX said:

In one word, 'efficiency' in power delivery.

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But if buy a Cooler master, OCZ or Silverstone 500 watts PSU thats not 80 plus certified, Will it be fine.
& In future i plan on buying a AMD 7770 gpu.

Re: [Buying Guide] Power Supply [UPDATED OCTOBER 2011]

mbk99 said:

Guys i want to know that is it necessary for a PSU to have 80 plus certification,
And what's the purpose of 80 plus PSU compared to simply 500 or 600 PSU's.

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Efficiency is the ratio between input and output power

A psu takes in AC power and converts it to low voltage DC power

In an ideal scenario entire AC power drawn from the wall socket is converted into DC power giving an efficiency of 100%

In the real world however there are power losses meaning some of the power is lost as heat

A PSU rated at 80% will consume 100w AC power to produce 80w DC power

Or a 600w PSU will consume 750w AC power to produce 600w DC power at 80% efficiency

The better quality components a PSU uses the higher will be its efficiency
Inversely u can bet than an 80 plus certified PSU will have quality components

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StrikerX said:

I personally don't like/recommend coolermaster PSUs. And I don't recall any ocz/silverstone/corsair/xigmatek PSU that's not 80+ these days.

Always buy a new PSU, never a used (more than a yr used) one. 7770 isn't a power hungry card, its quite passive so taking that into account buy any PSU but from a reputable brand. If you buy a bad PSU and it blows, there's a good chance it will take other components with it as well. So always invest in a good PSU.

And that's the end of my lesson

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Thanks mate now i will buy a new PSU thats 80 plus certified.

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hasanJ said:

Efficiency is the ratio between input and output power

A psu takes in AC power and converts it to low voltage DC power

In an ideal scenario entire AC power drawn from the wall socket is converted into DC power giving an efficiency of 100%

In the real world however there are power losses meaning some of the power is lost as heat

A PSU rated at 80% will consume 100w AC power to produce 80w DC power

Or a 600w PSU will consume 750w AC power to produce 600w DC power at 80% efficiency

The better quality components a PSU uses the higher will be its efficiency
Inversely u can bet than an 80 plus certified PSU will have quality components

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Thanks for your kind support & guidance mate.

StrikerX said:

I personally don't like/recommend coolermaster PSUs. And I don't recall any ocz/silverstone/corsair/xigmatek PSU that's not 80+ these days.

Always buy a new PSU, never a used (more than a yr used) one. 7770 isn't a power hungry card, its quite passive so taking that into account buy any PSU but from a reputable brand. If you buy a bad PSU and it blows, there's a good chance it will take other components with it as well. So always invest in a good PSU.

And that's the end of my lesson

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Bro what as if i buy a PSU from a PG premium seller. That is used & not 80 plus certified.

hasanJ said:

The better quality components a PSU uses the higher will be its efficiency
Inversely u can bet than an 80 plus certified PSU will have quality components

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That's not entirely true and you can not base your purchase on efficiency alone. Low quality components can also be used to produce high efficient PSU. For instance, Corsair CX series and Seasonic S12 II series both are 80+ BRONZE certified PSUs but the the later uses all Japanese capacitors compared to the Corsair unit which has mixed of Japanese + medium quality capacitor.

Baghi said:

That's not entirely true and you can not base your purchase on efficiency alone. Low quality components can also be used to produce high efficient PSU. For instance, Corsair CX series and Seasonic S12 II series both are 80+ BRONZE certified PSUs but the the later uses all Japanese capacitors compared to the Corsair unit which has mixed of Japanese + medium quality capacitor.

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Its a good measure since Corsair CX430 is rated 9/10 by JohnnyGuru

Likewise the Seasonic S12 II 520W is rated 9.7/10 at jonnyGuru. Also, if you read the conclusion of CX430, it says "Use of Chinese Samxon capacitors throughout." in The Mediocre that's the reason CX430 v2 came out and then the new CX430M (modular design made by CWT) which uses main Japanese capacitors (components used in said unit are superior I believe). I also think that the older CX430 is overrated, Antec EA-430D made by Delta is a better unit for little more in this power range.

atleast 500 watt psu requires.... what i am looking at is silverstone,corsair,fsp,xigmatek(outta stock).... so what u guys recommend?

kingofids said:

Assalam o Alaikum, I have a question.
I have a PSU of the readings below:
Model: TR2-430NL1Nh

Ac Input	115/230V -10/5 A - 50/60Hz
Dc Output	+5V	+3.3V	+12V1	+12V2	-12V	+5vsb
Max Current	24A	20A	14A	15A	0.3A	2.0A
Min Current	0.3A	0.5	1.0A	1.0A	0.0A	0.0A
The combined power of 5V and 3.3V is 130W max.

Now My pc Specs Are:
core i3 2120
1Tb harddrive
4gb ram
1 combo
now I want to ask that can i buy Hd 7750 or Hd 7770 so that they can work?
The psu is of thermaltake company. Please If anyone know then tell me.
Thanks

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So anyone know? Tell me still waiting for reply.

kingofids said:

So anyone know? Tell me still waiting for reply.

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This PSU is adequate for the GPUs you mentioned.

AMD HD 7770 have TDP of 80 Watts
AMD HD 7750 have TDP of 55 Watts

LeGenD123 said:

This PSU is adequate for the GPUs you mentioned.

AMD HD 7770 have TDP of 80 Watts
AMD HD 7750 have TDP of 55 Watts

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Thank you very much. I am buying hd7750 tommoro.^_^

which power supply is recommended for gigabyte 650 ti boost OC (it will be overclocked too)

my pc is core i5 23100, 4 gb ram, 500 gb hard disk and a 24 inch monitor lg ips (but it has its own power cord) so which particular power supply should i buy ?

is the corsair vs 550 as available on czone Power Supply - Corsair VS550 - 550 Watt Power Supply in Pakistan for Rs.5800.00 | Computer Zone suitable enough for it ?

my cpu is not overclocked (or even able to) but will most likely overclock the GPU, current power supply is thermal master 420 w which comes with the cooler master casing and its running same setup with saphire 6670 ddr3 1gb perfectly without any glitches so far :O

thanks in advance

I have asus p5g41t-mlx motherboard with 2 gb ram, 120 gb hard drive sata, nvidia geforce 9600t graphic card. can some one recommend what power supply should i use for this system? i have right now DANY's PM-40 400W power supply, ..is it enough, if not then Can someone recommend me any good power supply to go with my pc specs?

sogomogo said:

I have asus p5g41t-mlx motherboard with 2 gb ram, 120 gb hard drive sata, nvidia geforce 9600t graphic card. can some one recommend what power supply should i use for this system? i have right now DANY's PM-40 400W power supply, ..is it enough, if not then Can someone recommend me any good power supply to go with my pc specs?

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i think you don't need a new PSU as i had a 400 Watts unbranded PSU on my pc which has Core i5 3350p, 6 GB ram, 500 GB WD Blue & AMD 2400 pro.
So i think you r good with your current PSU.

i have Core 2 Quad 2 hdd 8 gb ram ddr2 and GTX 250 evga card which psu is better for me please help me

PSU basics:-

Learn everything about PSU from here.

Misconceptions about PSU:-

You should know that single rail PSU are not better then multi-rail PSU, details here.

System power consumption calculation:-

Calculate your total system power consumption from following links:-

1. Complex

2. Simple (recommended for noobs)

How to decide about PSU?

1. Make a list of all of your PC components that you plan to assemble and use; each PC component will require some level of power (electric current in watts) to function.

Example:

- Processor
- Motherboard
- RAM (single module)
- HDD
- SSD
- Cooling fan(s) in PC Chassis
- GPU
- DVD-ROM

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2. Consult link(s) in "system power consumption calculation" above to figure out how much power your PC may consume at full load; this would give you an idea of PSU strength (in Watts) needed to run your PC.

Example:

- Processor = 70
- Motherboard = 35
- RAM (single module) = 15
- HDD = 7
- SSD = 2
- Cooling fan(s) in PC Chassis = 1 each
- GPU = 50
- DVD-ROM = 15

Total = 201 (Watts)

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NOTE: For basic reference about power consumption requirement of a PC component, consult "PSU Basics" link (provided above) or this link. For reference about discrete GPU power consumption, see lists below.

3. Once you have an idea that how much power your PC needs to function (e.g. 400W), it is time for you to select a PSU which fulfills this power requirement (Be generous a bit; consider 450W PSU in case of 400W power requirement to be safe, never compromise on power requirement related matters of your PC). Of-course, your budget will dictate your choice in this matter but you need to be careful about what kind of PSU you select, you need to focus on following aspects:

• Price (Higher -> Better)
• Efficiency (Higher -> Better)
• Safety measures and durability (Higher the price of PSU -> Better internal safety measures & higher quality internal components to be expected)

FAQ: How much power my GPU consumes?



TDP = Thermal Design Power (Maximum power consumption of a GPU during load)

NVIDIA (GeForce 8 series and later)


AMD (Radeon HD 2000 series and later)

Baghi said:

That's not entirely true and you can not base your purchase on efficiency alone. Low quality components can also be used to produce high efficient PSU. For instance, Corsair CX series and Seasonic S12 II series both are 80+ BRONZE certified PSUs but the the later uses all Japanese capacitors compared to the Corsair unit which has mixed of Japanese + medium quality capacitor.

Click to expand...

Totally agree with you.

I found this out the hard way after buying a 600w Xigmatec tauro psu after hearing some good vibes about it on pg, but that psu turned out to be box of crap, didnt even use it for 3 days and put my old Antec neo power again in the pc.