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Thank you for your answer.

Now that I learned that the Kraken X61 won't fit in my case, I decided to go with Corsair H100i. Now I'm wondering are those stock fans any good? Are they loud? Should I change them? And if so, with what fans should I change them? And is the pump loud?

I have Define R4 and I'm interested in buying the NZXT Kraken X61. Will it fit on top?

This cooler should fit IMO.

Yeah, I will do some more diggin before buying and i hope someone who owns this case and tried mounting a 280mm rad replies to this thread.

http://www.overclock3d.net/reviews/cases_cooling/fractal_designs_r4_review/1 But here says it can support 280mm radiators. I'm so confused.

I'm definetly not going to mod my case, but it has 2 140mm fan positions on top and the only problem I see is the space between the mobo and the cooler.

Well it has 2 140mm fan positions on top so I assume it should support 280mm radiators.

Will the NZXT Kraken X61 fit inside Fractal Design Define R4? I know it supports 280mm coolers, but people are saying that there are clearence issues with motherboard heatsinks. My mobo is Asus M5A97 R2.0.

Nobody knows, but in my opinion it shouldn't take much longer.

A lot of people are saying that a huge DDoS attack is attacking servers in USA and their ISP's. Most likely the attack is coming from China or North Korea so the servers won't be available until the attacks stops.

The only settings you have to change is multiplayer and the CPU voltage. Raise the multiplayer so your CPU will be at 4 GHz and increase the voltage just for a littlebit every time your PC crashes or you get a BSOD. And once your PC doesn't crash or BSODs on a stress test you got yourself a stable overclock.

The brand doesn't matter. Yes it's different but it would still work. Yes you can crossfire 280x and the 280 but the 280x wouldn't be used to it's full potential due to it would need to adapt to the slower 280.

280x is not worth 400$. Still, the upgrade from 750 TI to 280x is worth it but not for 400$. For that money you can buy 290.

Yes. Yes. No. It has to be the same family of GPUs (like 7900 series can crossfire, but the 7900 series can't crossfire 7800 series). The amount of VRAM doesn't matter.