Hey guys. i decided to ask you in the off-topic section if everything fits together. especially the PSU.
CPU : i5 4570
GPU : Radeon R9 280X 3GB
MSI H87-G41 Motherboard
8 GB 1600 DDR3 RAM
1 TB SATA3.
Here my question ; will the computer work with a 600W LC-Power LC6600 V2.2 Silent PSU?
thnx for answers 
It will work, but I would not cheap out on a PSU. A quality PSU must be used when building a high performance computer to ensure the computer parts are not damaged.
I would recommend a Corsair builder series PSU, 500w is enough but I would get the 750w for possible future upgrades. It is alot more expensive, but it is a lot better PSU.
Okay. but atm i dont have that much money fot such a psu. What do you think about a 630W Thermaltake Smart 80+ ? amazon.de/Thermaltake-Smart-SP-630PCWEU-PC-Netzteil-L%C3%BCfter/dp/B006DKGZPU Because i will overclock the gpu i think. so 500w might be not enough.
Sorry for the German website
500 W should be enough… a good PSU wouldnt cost more than about 60 euros.
This one is good, the XFX Pro Series
tweakers.net/pricewatch/279914/xfx-pro-550w.html
yeah okay. but its possible that i’ll upgrade in the future. And yeah. i’d just like to know how the 630W Thermaltake is. because i dont have many options to choose.
Anyways , thanks for the help 
Recommend calculating the value: extreme.outervision.com/PSUEngine
I calculated the value for you: Minimum PSU Wattage: 400 W / Recommended PSU Wattage: 450W
I use a Corsair CX600, specifically for a future upgrade.
I would recommend the Seasonic SS-650AM Modular PSU, 650W is all you need, even for future upgrades. It’s 80+ certified so it saves you money on electricity bills. Also it’s modular so there’s no messing around with loads of cables.
to echo everyone else, NEVER skimp on the PSU. A cheap PSU will be inefficient, will die more quickly, will provide unstable voltages and will be more likely to take other components with it when it dies. Before you buy a PSU check to see if it has been reviewed by any good review sites, such as jonnyguru.com/
(a couple of years ago that was considered one of the best PSU review sites out there, but this may have changed since).
One other thing. I assume you know that if you ever want to overclock the processor you will need to use a Z series motherboard and a xxxx-k processor. Without both of these you cannot overclock the CPU (or at least it will be incredibly limited)
Again echoing everyone else, years back the family PC was a shop bought gateway with a cheapo 300w PSU. Only an Athlon X2 and a Nvidia 7300LE, but it only lasted 3.5 years then it popped and took the motherboard out with it. Fortunately the hard drive was fine, but as it’s directly connected to the PSU, it’s definitely something I wouldn’t take a risk on. I would also recommend the Corsair CX600, it’s run my system with 2 GPUs for a while now and touch wood, it’s still working great. Thermaltake have been known to have some issues with PSUs in the past (not delivering rated outputs), but generally seem to have a good reputation.