Heres the build. Is 550 watts enoug power?
Amd 8320
asus m5a97 r2.0
7870
8 gigs ddr3
4 hard drives
1 ssd
xfx core edition 550pro
I would say yes, I ran a FX6300 @4.2ghz and a 7950,5 fans, 2 hard drives,1 SSD, with an external hard drive on that same PSU no problem. You can build your system on PCpartpicker and it will give you an est. wattage near the top right corner.
I would drop the SSD (or some of the HDDs if you haven't bought them) and up the motherboard to a M5A99x, much better for the 8320. You can add the SSD later.
550W will be enough.
Even the 450W model would be enough.
big +1
also 550W is more then enough for a single GPU setup. i would also take one harddisk for now, because storage does not give me any performance boost, i would personaly put that money in a better gpu, R9-280X would probably a littlebit out of budget, but a Radeon 7950 should be possible.
Grtz Angel ☺
Ideally you'd never go over about 80% of your PSU rating, so 450w is pushing your luck if your going to run a overclock on either cpu or gpu (especially gpu) and limits upgradeable in future. The 550w is much better value as its just enough power to handle a bunch of extra HDD's serous overclock on both cpu and any high end graphics card you may upgrade to later.. so unless your looking at crossfire or SLI its good enough and will never restrict what you can do.
Having said all this as I'm typing this I am overloading a 90w supply with my overclocked laptop... so you'll basically get away with whatever if you stick to good brands and avoid the Corsair CX series (the one exception to choosing by brand).
For that exact setup it should be fine, however I am going to be the devils advocate, with single cards like the R9 290(x) using 300Watts alone 550W could leave little power left for other components even in a single card configuration, with dual cards being completely out of the picture, completely, meaning that when it comes to upgrading the system you need to replace the PSU and the GPU. A good 650W-750W PSU would not cost much more(in the US), some of them like the HX series by corsair come with 7 year warranties and should be good for a long time for a single card configuration.
Yes, it'll work just fine.
Sorry but even a computer with FX-8350 and 7970 GHz edition uses less than 380W in BF3. Those are currently one of the most power hungry CPU and GPU. You couldn't hit even near the limit by overclocking OP's setup. With that said, I agree that the 550W edition would be a better long term choice because it's usually only 10 euros more plus it has an additional PCI-E cable (450W only has one so it needs a molex adapter for most high end cards).
It's sad that power usage is almost always wildly exaggerated. I guess it's because GPU vendors have to recommend high minimum requirements for people with crappy power supplies so they wouldn't sue when those Chinese 30€ PSUs die and break the customers computer.
Here's a chart of a system with 3770K, 2 SSD's, Bluray player, 8GB RAM and Gold certified PSU; http://i.imgur.com/qA0LqYS.png That's the whole PC power usage while playing BF3. As you can see, even a high end system doesn't need that much power with default clock speed.