620w or 520w - What is the best for my build?

[Donrobot22]

Hey!

I have trouble to decide between a Seasonic S12II 620W PSU and a Seasonic S12II 520W PSU.

My build :

PSU : Spire ATX 420w PFC-N-PSU (Current psu)
CPU : AMD FX(tm)-4170 Quad-Core 4,20 ghz
CPU Cooler : The CPU Cooler include with the CPU
Memory : 8 go (2x4 go)
Motherboard : msi ms 7641 ver 4.0
Video Card : AMD Radeon HD 6450 1go
Storage : 2x Western digital green 2000 Go (2x2000go)
Operating system : Windows 7

Yes it's a bad build but the pc work !

The 620w psu won't affect the performance of the pc ?
What is the best in efficiency for this build, alsoi will change the cpu cooler and GPU in the future.

Thank you in advance

 

[clutchc]

The 520W is more than enough for what you have now. But there is nothing wrong with going bigger.

 

[Flyfisherman]

Hi,
Without question the quality of the psu you are thinking of (which can indeed be questioned);
Req. Radeon 4650 - 24A and a 350-400W PSU minimum

As a baseline: a PSU with 40-50% 'over power' than the req. will make the PSU most efficient and it can handle the GPU power (amp really) peaks in a short bursts.
A good PSU with silver or gold standard has a very low disturbance and clean voltage through the distributions of the power lines.
Go for a 80+ PSU

Citat: https://www.techpowerup.com/forums/threads/how-does-psu-efficiency-affect-me-and-do-i-really-need-an-80-plus-gold-power-supply.129456/
So what do the different 80 Plus ratings mean?

The basic 80 Plus rating means that the PSU is rated for at least 80% efficiency at 20% load, 50% load, and 100% load.

The 80 Plus Bronze rating means that the PSU is rated for at least 82% efficiency at 20% load, 85% at 50% load, and 82% at 100% load.

The 80 Plus Silver rating means that the PSU is rated for at least 85% efficiency at 20% load, 88% at 50% load, and 85% at 100% load.

The 80 Plus Gold rating meas that the PSU is rated for at least 87% efficiency at 20% load, 90% at 50% load, and 87% at 100% load.

The 80 Plus Platinum(bet you didn't know there was a Platinum) rating means that the PSU is rated for at least 90% efficiency at 20% load, 92% at 50% load, and 89% at 100% load.

Now, that doesn't mean that the PSUs perform exactly at those numbers, but they are close enough, and of course you probably aren't going to use exactly 50% load or whatever, but it is close enough to give a good idea of what a PSU is capable of.

Best regards from Sweden

 

[Dark Lord of Tech]

They are usually around the same price , 520w is plenty for those specs , but if price is close get the 620w , can't hurt.

 

[Donrobot22]

Thank you for your answers, yes the 620w is 8$ more in my country.
It will turn on ?
I saw that it couldn't if the psu have too much watt.

 

[Dark Lord of Tech]

It will run , the computer will only draw the power it needs to run , extra wattage can't hurt.

 

[Donrobot22]

Ok then for a 8$ extra it's worthy

 

[Dark Lord of Tech]

Yes for sure.

 

[Donrobot22]

Ok thank you

 

[Dark Lord of Tech]

Glad to help.