How powerful of a PSU should I need?

Nvidia specs page says 400W PSU with one 6 pin - which is hilarious!

I recently bought a used GTX 570 and that thing wants two (!) 6 pin connectors and 600W PSU .... i´ll go cry now.

(i know under the hood all those requirements stand and fall with available Amperes on the 12v 6 pin lines, but the change in power consumption from 570 to 960 is just cringeworthy)

A 450W is probably enough for just this, but if you're ever gonna add parts or upgrade i'd go with more just to be sure.

450W should work
500W is enough
600W if u plan to put something something in at a later date

You can make a 960 consume ~75-120w or so, depending on clocks. Adding that last 20% performance uses like 1.6x more power because of voltage scaling, it's pretty nasty but they're amazingly efficient around 1200mhz.

Power is not everything. Quality is important too. See here: http://i.imgur.com/tgrbCnr.jpg

According to http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-960/specifications , 400W is recommended minimum system power. I'd say be on the safe side and add about 100-ish. If you have the money for it. And go for quality.

450W should be enough, but it's up to you how much of a margin you want to have upwards.

I'm personally running this setup with a 450W bequiet without any issues (it is somewhat borderline, though, I guess):

• ASUS Maximus Formula VII
• Intel i7-4790K
• ASUS Strix GTX970
• 4x8GB DDR3-2666
• 2 x 5400 RPM HDD
• 1 x SSD
• 4 case fans
• 8 USB devices

Even 400W will be enough.

Depends on which power supply exactly you're going to choose. In any case, 4460 + GTX960 don't consume more than 250 - 280 Watts under full load, so even a decent 400W PSU would be a good choice. Oversizing your PSU results in decreased efficiency and more money spent then needed, in some cases.
450W is plentyful, under the condition you're going to choose a decent model (example: bequiet straight power E10)

There are many online psu calculators you can use - google for one. That's how I work out what I need.

400W will be enough, 450W will be more than enough. Especially if it's got a good 80+ rating.

from my experience with pc's id suggest you a 550W (i checked it with the specs you gave + a DVD, 2 USB devices and that you might want to have it for more then a year), to get a general idea i usually use a PSU calculator like this one and add 100W, since you dont want your psu to run close to 100% of what it can give because it shortens its lifespan. also about +80 certified, that does help since with those you are more likely sure that you have voltage on the line to power your pc. like with cheap psu, it may be written that it has 500W but its less then that a +80 certified gives you 80% effectiveness, +80 bronze gives 82%, +80 silver 85%, gold 87% and +80 platinum 89%. next this youd want to have is security since it will help you protect your pc in case of a blackout and the necessaries a psu should have are: Under Voltage Protection (UVP), Over Current Protection (OCP), Over Load Protection (OLP), Over Temperature Protection (OTP), Over Voltage Protection (OVP), Short Circuit Protection (SCP), and lastly avoid blacklisted brands like these also add modecom to those. the brands you want are like BeQuiet, SilentiumPC, Chieftec, Corsair, Tagan, Enermax or Zalman (those are all i remember on top of my head, but theres more)

well well well, PSU is like a HEART of your system. You should understand it before you buy.

1. take a look on this site to calculate How much power do you need
   (http://www.corsair.com/en/psu-finder)

   My suggest : forget 600W. (even the site say you need only 450W or so) 800+ would be the best choice since your VGA.is NVIDIA. And beware of next generation game. Take GTA V, Witcher 3, Batman AK .... as example. in the next 2 or 3 years you might need another GTX960 for SLI or even worse... a whole new GTX980 or mother of fucking Titan. I could tell you that most NVIDIA end up with GTX_80 consume a lot of power (GTX880, GTX980)

2. 80+ certified......of WHAT. BRONZE? SILVER? GOLD? .... you must understand it.
   image
   If you are not Enthusiast . Well...bronze would be enough.

3. BRAND.
   Top choice would be Seasonic, Corsair, Antec,XFX and Enermax. if you live in the State. Seasonic and Corsair priority.
   For get Cool Master and Thermaltake. They look cool. Yes. They are cheaper: Yes.
   but it just like ADIDAS, NIKE and some Fake shoes from china. If you have time and take a deep looking how they built a PSU you will understand what i mean.

4. Finally. Even with BRAND name powerful PSU, you still might make some bad decision. So google it before you buy. A quick Review might help a lot. If you are lazy to read. Well just skip it until the end until... WORTH to Buy or not.

Good Luck

I run a 290x with a 650W 80+ gold, you don't need anything higher than a 650W if you don't sli, especially if using a power friendly card like the 960 or 970

A quality brand 450 watt is fine.

Don't get anything above Bronze -- (Silver, Gold) are a waste of money, IMO.

If money is no factor, then get a higher watt just in case you upgrade your video card down the road.

A really good quality 450 W, as many people said. Things like FSP, Chieftec and up in brands.

power consumption of your rig is expected to be 260-300W (TDP). In this case 400 watts should be enough, but it's not recommended. To be on a safer side get a 500/550W PSU since usually these are not much pricier than 450 models. Buying more powerful power supply is a good idea only if you are planning to run SLI in the future.

As people have said, 450W will definitely be enough. Just make sure that you get a good quality model - a lot of the times, lower quality models that are labelled 450W don't actually output that much - especially as your load increases. I know some PSUs can drop down to half output. Keep in mind that this won't allow very good upgradeability either.

just remember one thing when you choose a psu: their maximum efficiency is often at peak when at 50% of load and the minimum at low (10-20%), so choose a 450-500w at max.
Choose quality over brand or raw power: the psu is the heart of your system, good stabilty in voltages means longer life for all your component. ;) seasonic, antec (the hcg series is just a rebranding of seasonic), flower, fortron, enermax (this one is overpriced, imho) are just a few brands i can suggest to you. :D

450W should be enough, even for some minor upgrades, but if you think you might get a new graphics card or CPU then go for the 600W, keep in mind the money, if the difference between the 450 and 600 is not that big, then might aswell get the 600W one, PSU are more efficient at around 80% load, higher or lower the efficiency gets down.