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What PSU i must go?

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  • Intel i5
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Last response: in Components
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March 26, 2014 8:08:18 PM

hello all,i decide to build new desktop,so here is the list of my desktop componenets
processor:I5-3470
Ram:G Skill F3-10666CL7D-4GBRH
MOBO:Gigabyte LGA 1155 GA-H61M-DS2(rev 3.0)
VGA:Sapphire Radeon HD7730 GHz Edition 1GB DDR5
HDD:WD 7200 RPM 500GB Caviar blue 16MB Cache
Optical Drive:Lite On DVD RW
Monitor:LG LED with max resolution 1360x 768

i interested on Seasonic SS-500ET 500W.....so is this good enough for my build?
i ady check it with psu calculator,and the result is that i need 306 w psu,but im not sure about that hahaha

and 1 more think is there any bottleneck happens in my build?

More about : psu

March 26, 2014 8:12:29 PM

Yep, should be fine all around :) 
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March 26, 2014 8:18:23 PM

Your minimum requirement is no more than 350watts, here you go with simple PSU:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($19.99 @ Newegg)
Total: $19.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-26 23:16 EDT-0400)

The GPU is the only thing which will hold you back from playing modern games. Rest build looks good ;) 
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March 26, 2014 8:25:31 PM

A 7730? No way you need 300W+ for that. I doubt you'd cross 150W with that system. The CX430 is fine.
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March 26, 2014 8:45:50 PM

brarboy said:
Your minimum requirement is no more than 350watts, here you go with simple PSU:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($19.99 @ Newegg)
Total: $19.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-26 23:16 EDT-0400)

The GPU is the only thing which will hold you back from playing modern games. Rest build looks good ;) 


yeah i know,the reason why i buy 500 w psu for future upgrade,and the i choose 7730 because limited budget hahaha
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March 26, 2014 8:49:35 PM

:)  That's what I was thinking when I saw it and the rig...good thinking ;) 
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March 26, 2014 9:28:12 PM

Tradesman1 said:
:)  That's what I was thinking when I saw it and the rig...good thinking ;) 


anway i want to ask u something,example i using psu calculator,and the result is that i need 300 w psu,is that mean i must have psu with efficiency that provide 300 w(example,psu 80 certified,so i buy psu 370(only example),so the efficiency 80% x 370=296,i assume that the efficiency just 300 w),or is that mean that 300 w input only without calculating the efficiency?
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March 26, 2014 9:37:22 PM

There's a variety of calculators out there, and many give different totals , PSUs can be off also, more and more you see PSUs advertised at what basically is their Peak output opposed to their continuous output, i.e. might have a 550 watt PSU, but if you look at the label on it, the 12volt rail may only be for 425 or 450, which is what you need to know....in most rigs it's the GPU that's going to need the most voltage , I just try and figure what it should need and normally add an extra 50 watts or so for headroom - add on's medium upgrades, etc
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March 26, 2014 10:38:48 PM

Tradesman1 said:
There's a variety of calculators out there, and many give different totals , PSUs can be off also, more and more you see PSUs advertised at what basically is their Peak output opposed to their continuous output, i.e. might have a 550 watt PSU, but if you look at the label on it, the 12volt rail may only be for 425 or 450, which is what you need to know....in most rigs it's the GPU that's going to need the most voltage , I just try and figure what it should need and normally add an extra 50 watts or so for headroom - add on's medium upgrades, etc


so just like wat u said,the 550 watt ATX12v only be for 425 or 450(its mean that the efficiency of the psu around 82%,because 0,82 * 550=451,i assume 450 for this case),arrive at my conclusion,so to decide what psu we must know:
1.how much power we need
2.The Efficiency of our psu,it means how much power can be used(psu power*the efficiency of psu=power that can be used in watt)
3.The extra watts for future upgrade
is that right?
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March 26, 2014 10:53:59 PM

electricsnake said:

yeah i know,the reason why i buy 500 w psu for future upgrade,and the i choose 7730 because limited budget hahaha


then pick a psu accordingly. Depending upon what gpu you will be buying in future, we can suggest one for you.
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Best solution

March 27, 2014 6:17:13 AM

Quote:
so just like wat u said,the 550 watt ATX12v only be for 425 or 450(its mean that the efficiency of the psu around 82%,because 0,82 * 550=451,i assume 450 for this case)


No, that's not what it means. This is a common misconception so let me clear it up. The problem that brarboy stated is basically PSU manufacturer listed "peak" power. Meaning they can't really put out that much power. (Or they flat lie in some cases.) The biggest power drawing things in your PC run off the 12V rail so you need most of the power there.

Efficiency as you keep trying to do the math is something else. If you have a 500W PSU that is 80% efficient it better be able to put out 500W or else the manufacturer lied. You don't take 500 and multiply by .8 to get 400W output. Again, a 500W PSU better really put out 500W. The efficiency rating is how well it turns the AC electricity found at the wall into DC electricity your tower uses. An 80% efficient PSU will draw 625W from the wall to make that 500W. A 90% PSU will need only 556W. This matters as you get billed by your electric company based on how much power you take. The more efficient your PSU, the less power you'll pull from the wall, and the lower your electric bill will be.

Buy a larger then needed PSU if you will be upgrading, but don't buy one and hope you'll upgrade. The right size PSU for the task. A 500W PSU running ~150W is near sub 20% of total output and it won't be very efficient at providing the power. A system at idle or just surfing the web is usually around 100W and that is 20% of the output.
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