PC water cooling - choosing radiators

[KrzysiekX10]

Hi.
I'm planning to build a gaming PC with a super-quiet water cooling system. It is going to cool an Intel Core i7-4790K processor and two MSI R9 290X Lightning graphics cards. As for radiators I'm planning to use:
-one Alphacool 80mm thick dual 120mm radiator with four Cougar CFD LED fans in push-pull configuration
-one Alphacool 30mm thick dual 140mm radiator with two Bitfenix Spectre Pro LED fans in push configuration.
Both radiators have 9 FPI ratio. You can check the fans' specs here:
-Cougar: http://www.cougar-world.com/products/fans/cfd_blue_led_fan.html
-Bitfenix: http://www.bitfenix.com/global/en/products/accessories/spectre-pro-led/

My question is: is that going to be enough?
If yes, then how much overclocking possibility would I get?
If not, then what would be enough?

 

[cysquatch33]

I was always told 1 radiator per component cooled as a rule of thumb. Now that R9 290X is a hot card and you're planning on running 2. I would think of trying to get another bigger cooler instead of the 120mm radiator. What case are you running

 

[KrzysiekX10]

I was always told 1 radiator per component cooled as a rule of thumb. Now that R9 290X is a hot card and you're planning on running 2. I would think of trying to get another bigger cooler instead of the 120mm radiator. What case are you running

I've chosen the Nanoxia Deep Silence 5 as my case. It's big tower, it's going to house the super-thick 240mm radiator at the front and the slim 280mm radiator at the top.