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How do you know how many watts are needed from a PSU for a build?

Last response: in Components
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January 19, 2014 8:37:35 AM

Hello all,

What I want to know is how you know how many watts are needed for a system build,

Thanks all :) 

More about : watts needed psu build

a b ) Power supply
January 19, 2014 9:06:38 AM

What I normally do is Google a review of the Graphic card. Look for power consumption. Then add 20%->30% to the listed wattage (make sure it says SYSTEM and not just card). If planning on adding a 2nd GPU in SLI/Xfire then google that configuration.

1) Always try to select a PSU from tier 2 (Tier 1 are generally much higher priced) and do NOT select less than a tire 3 PSU.
2) PSU calculators are nice except they take into account that you may have/buy a tier 4 or Lower PSU and retire a generally higher value than really needed.
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January 19, 2014 9:36:33 AM

Well, i'm going to list the build, I don't know how to find out the wattage..

Cpu: AMD FX-6300
http://www.amazon.co.uk/AMD-FX6300-Edition-4-1GHz-Socke...

Motherboard: MSI 970A-G46
http://www.amazon.co.uk/970a-g46-Motherboard-Raid-Gigab...

Ram: Corsair Select 4GB
http://www.amazon.co.uk/Corsair-CMV4GX3M1A1333C9-Select...

Graphics Card: Asus HD7770-DC-1GD5-V2
http://www.amazon.co.uk/dp/B007RS49EG/?tag=pcp0f-21

PSU: Corsair Builder Series CX430Watt
http://www.amazon.co.uk/Corsair-Builder-Series-Bronze-S...

HDD: 1TB Western Digital Caviar Blue HDD
http://www.amazon.co.uk/Western-Digital-internal-Hard-D...

Case: Fractal Design Core 1000
http://www.amazon.co.uk/Fractal-Design-Core-Series-Micr...

The power supply is a CX430 Watt, will that cover the build?

Thanks :) 
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January 19, 2014 10:01:28 AM

chris987 said:
1 you need at least the 2gb of the 7770
2 4bg is the absolute minimum better get 8gb
3 you need a more capable psu.its beraly enough. something like this will also allow you a future gpu upgrade
http://www.amazon.co.uk/Corsair-Builder-Series-Modular-...


...

I'm going to upgrade in the FUTURE, all I want to know is if the PSU can cover the build.

And I can't pay 30 pounds more, 350 is my budget
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January 19, 2014 10:04:01 AM

SR-71 Blackbird said:
It's not a very good PSU.


Low quality? Not enough watts? Why is it not very good lol

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January 19, 2014 10:07:07 AM

SR-71 Blackbird said:
Low quality cheap capacitors , but will run your specs.

I would get this one.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($44.99 @ Amazon)
Total: $44.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-19 13:03 EST-0500)


Ok so, it's bad because it's likely to break? Ok well, is this one better?

Corsair CX500M

http://www.amazon.co.uk/Corsair-Builder-Series-Modular-...

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a c 1869 ) Power supply
January 19, 2014 10:11:03 AM

All CX series supplies are poor.
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January 19, 2014 10:19:45 AM

SR-71 Blackbird said:
All CX series supplies are poor.


Ok, thanks for the info. So should I use that power supply? The Corsair Builder Series CX430Watt,
In 2 months or so I will most likely upgrade it and add another 4gb module of ram. Will it work for that long?


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a c 1869 ) Power supply
January 19, 2014 10:20:47 AM

The CX430 wil run your specs , then upgrade later.
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a b ) Power supply
January 19, 2014 10:25:54 AM

the evga is better quality better go with that if you cant afford the 600w corsair ,which even its a lower quality can provide a better future upgrade
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a c 1869 ) Power supply
January 19, 2014 1:57:33 PM

Yes that is the one.
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January 23, 2014 10:47:10 AM

It always depends on what stuff youreusing but if its a budget build i would use the cx500 or cx430 and corsair or xfx for psu
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