PSU Wattage Amount

[Grabster3d]

So I am planning to get a build with a 4670k, msi gd45 gaming, 8gb ram, an ssd, a hard drive, 2 7970s, and quite a few fans. I will be overclocking the 470k and also the 7970s. Should I get an 850 watt PSU or will 750 watt be enough, or should I go even higher?

[Lord Pantaloons]

750w 80+ gold is as low as you should go.

[TheSLSAMG]

I would get the 850 and run on the safe side.

[CoolBeans]

750w

[nsyedhasan]

Having better is always better. So I would say 850Watt.

[CoolBeans]

Having better is always better. So I would say 850Watt.

Except when it comes to efficiency

[mgsstar]

I would get the SeaSonic M12II 850 SS-850AM or the SeaSonic X Series X-850 if you can afford it.

[Stonep11]

So I am planning to get a build with a 4670k, msi gd45 gaming, 8gb ram, an ssd, a hard drive, 2 7970s, and quite a few fans. I will be overclocking the 470k and also the 7970s. Should I get an 850 watt PSU or will 750 watt be enough, or should I go even higher?

Efficiency really only matters if you live in an area with expensive power, so if your power bill isn't a concern, don't worry.  While you can get the minimum to power it with a 750W PSU or something, the closer you are to that max, the more the PSU will be fighting to cool itself and the louder it will be.  I would give a 250W cushion to keep the fan curve down.

 

Example in link:  http://www.google.com/imgres?client=firefox-a&hs=0Od&sa=X&rls=org.mozilla:en-US:official&biw=1440&bih=780&tbm=isch&tbnid=ePzLFkHjU7GguM:&imgrefurl=http://www.xcpus.com/powersupplies/cooler-master-silent-pro-hybrid-1300w-unboxing&docid=Vcj3Sbw03tDBZM&imgurl=http://cdn.xcpus.com/wp-content/uploads/2012/01/fan-curve.jpg&w=549&h=317&ei=mjxOUtDCKYqMqgH-nIBg&zoom=1&ved=1t:3588,r:0,s:0,i:81&iact=rc&page=1&tbnh=157&tbnw=257&start=0&ndsp=20&tx=153&ty=84

 

EDIT:

IF you DO care about efficiency http://www.google.com/imgres?client=firefox-a&hs=0Od&sa=X&rls=org.mozilla:en-US:official&biw=1440&bih=780&tbm=isch&tbnid=FDs5I3FrCjJXQM:&imgrefurl=http://www.xcpus.com/powersupplies/cooler-master-silent-pro-hybrid-1300w-unboxing&docid=Vcj3Sbw03tDBZM&imgurl=http://cdn.xcpus.com/wp-content/uploads/2012/01/efficieny-curve.jpg&w=552&h=311&ei=mjxOUtDCKYqMqgH-nIBg&zoom=1&ved=1t:3588,r:1,s:0,i:84&iact=rc&page=1&tbnh=161&tbnw=278&start=0&ndsp=20&tx=175&ty=96 the load also changes that

[Reuben]

Except when it comes to efficiency

Like this PSU vs this PSU.

[Stonep11]

TL;DR  Even though people hate on "over-kill PSUs" it isn't that much more expensive, and by going about double what you need you get some nice advantages, but hey, if it isn't even the loudest fan or efficiency doesn't matter, then just get whatever is enough.

 

Efficiency really only matters if you live in an area with expensive power, so if your power bill isn't a concern, don't worry.  While you can get the minimum to power it with a 750W PSU or something, the closer you are to that max, the more the PSU will be fighting to cool itself and the louder it will be.  I would give a 250W cushion to keep the fan curve down.  I have a 1000W PSU for a OC'ed 680 and 3770k, I don't need all that power, but it keeps the PSU super quiet and I have the ability to keep it for future SLI builds or higher power draw parts if something comes in the future.

 

Example in link:  http://www.google.com/imgres?client=firefox-a&hs=0Od&sa=X&rls=org.mozilla:en-US:official&biw=1440&bih=780&tbm=isch&tbnid=ePzLFkHjU7GguM:&imgrefurl=http://www.xcpus.com/powersupplies/cooler-master-silent-pro-hybrid-1300w-unboxing&docid=Vcj3Sbw03tDBZM&imgurl=http://cdn.xcpus.com/wp-content/uploads/2012/01/fan-curve.jpg&w=549&h=317&ei=mjxOUtDCKYqMqgH-nIBg&zoom=1&ved=1t:3588,r:0,s:0,i:81&iact=rc&page=1&tbnh=157&tbnw=257&start=0&ndsp=20&tx=153&ty=84

 

EDIT:

IF you DO care about efficiency http://www.google.com/imgres?client=firefox-a&hs=0Od&sa=X&rls=org.mozilla:en-US:official&biw=1440&bih=780&tbm=isch&tbnid=FDs5I3FrCjJXQM:&imgrefurl=http://www.xcpus.com/powersupplies/cooler-master-silent-pro-hybrid-1300w-unboxing&docid=Vcj3Sbw03tDBZM&imgurl=http://cdn.xcpus.com/wp-content/uploads/2012/01/efficieny-curve.jpg&w=552&h=311&ei=mjxOUtDCKYqMqgH-nIBg&zoom=1&ved=1t:3588,r:1,s:0,i:84&iact=rc&page=1&tbnh=161&tbnw=278&start=0&ndsp=20&tx=175&ty=96 the load also changes that

[laxer]

I will second/third a vote for a good 80+ 850W PSU.

[lachyman]

If you don't want to OC/expand 750W will do. Otherwise get 850W.

[nsyedhasan]

Except when it comes to efficiency

Most power supplies are now either bronze or silver 80+ cerified.

[CoolBeans]

Most power supplies are now either bronze or silver 80+ cerified.

When you have an i3 with a 1500w PSU, the efficiency will be crap

[nsyedhasan]

When you have an i3 with a 1500w PSU, the efficiency will be crap

Oh that's what you I though you meant the 80+ rating.

[Grabster3d]

So I was thinking http://us.ncix.com/products/?usaffiliateid=1000031504&sku=78945&vpn=P1850BBEFX&manufacture=XFX&promoid=1317

 

Thoughts?

[mgsstar]

So I was thinking http://us.ncix.com/products/?usaffiliateid=1000031504&sku=78945&vpn=P1850BBEFX&manufacture=XFX&promoid=1317

 

Thoughts?

This is a pretty good psu because it is made by Seasonic.