Since the site you are using is not in English I will refer to tomshardware which does the most extensive testing out of any site that I know of.

Here is the direct link with the wattage usage for a non-overclocked system using a GTx 980. It is on the low end and suprisingly lower than I orignaly thought. Avg draw is ~175W peaking at just under 350W. This is one Sata device, adding a second would at max add another 10W per device. The average machine has 2 or 3 so we can  asume 360W max load for an average PC.  

360X1.2 so that you have teh 20% overhad puts you at 432 Watts. If you have a PSU with enough conneciton for everything you would be perfectly safe with a 450W Silver PSU, or a 475W Bronze. You could get by with a 400 but the PSU will have a higher chance of failure working at 85%+ of max fequently.  The power draw shown for 60 seconds reaches max draw frequently enough to base your PSU purchase on that.

Here is the link. http://www.tomshardware.com/reviews/nvidia-geforce-gtx-980-970-maxwell,3941-12.html. Look for graph labeled with TOTAL.

I understand that the Bronze/Silver/Gold is about effeciency and that the W rating is how much output it has. 

The reason I suggest a higher W output for a Bronze vs a Silver is because for a Bronze level PSU to output the 450W it has to work harder than a Silver one doing the same. The harder a PSU has to work the faster it will break down.  If a Bronze level PSU is working non-stop close to it's max output it will die much sooner than a Silver rated one. Bronze PSU max output are typically very close to their power output rating while Silver and Gold rated PSUs typically have a higher max output then their Power Rating. This is not always the case but I have learned to err on the side of caution for PSU selection.

Sticking with a brand that is well known for underrating their PSU wattage output is also another sound way to avoid the Gold/Silver/Bronze strategy I listed above. You could also do all of the above, never buy less than Silver, stick with well known brand and buy lines of PSU that is known to underrate their PSU wattage output.

While I absolutely respect Tom's Hardware I will go by my personal experience(I use a power measurement tool on my current PC) and that of computerbase which I absolutely trust. My PC will only have 2 SATA devices. One SSD and one slow spinning 2TB drive which won't even reach 10W together. There also won't be a lot of fans inside the case.

I am expecting with the big maxwell and i7 57xx with both base clocked an overall draw below 350W. Sadly There isn't much choice regarding low powered PSUs with high 80+ standards. Looks like I'm limited to Enermax 430W Gold, BeQuiet 480W Gold or Enermax 500W platinum.

So ultimately this whole discussion is pointless because the market won't let me buy a 400W Platinum or Gold PSU to my liking^^

The PSU market really needs to step up its game. I couldn't even find a proper 100-200W Gold PSU in ATX form factor for my cute little server that consumes 80W at peak.

Can someone help me? i am building a pc on February but i am not sure if i should change something in my build.
http://pcpartpicker.com/p/8jXJP6

Mr playstation your threads are good. Nintendo plus ms fans outnumber ps fans on here so that's why you get stick.

In total spent around £800, including original build (£500) and then upgrades over the past few years (SSD, New GFX card and Ram)

I can play FarCry 4 at Ultra, but need to have AA on low to maintain a solid 60FPS when high action is going on.

And nobody can run Unity at a solid 60fps 1080p. Nobody.

If this is to prove console gaming is cheaper. Pc doesn't pay for online, and the steam deals are much better than anything on console

Thanks I guess. But what does the second sentence mean?

Why are you even asking if you know what the answer should be like? Your making it sound like a pointless thread for an answer.

The >200 posts this thread got begs to differ.