Having two 200mm exhausts is probably not constructive, the front one will just suck out all the cool air before it reaches any of your components.
What makes you think CM MegaFlow coolers are any better than the 200mm fans already includede in the 630?
If you want actually quiet cooling, dont use huge fans like that. Use 140mm fans at 500-800 RPM. I'd probably set it up like this: 140mm rear and top exhausts, 2x 140mm front intakes, all 1000RPM and downvolted to 7V.
If you want 200mm coolers anyway but want to quiet them down, downvolt the stock ones. I believe your case already has an inbuilt fan controller for this.
What components are you going to be cooling?
Yes it has a Built it fan controlled but i think im doing something wrong here.. The components inside are the following:
-ASUS Sabertooh Z87
-EVGA GeForce GTX 780 w/ACX Cooler
-Dominator Platinum Series from Corsair 2800c12
-ASUS Xonar Essence STX
-Corsair AX860i (Fan is facing down so its not a problem at all)
-One SSD and one HDD.
That all inside the case, also a Corsair H110 with a 4770K at 4.2GHz, i have 4 Corsair AF140MM, 2 in the H110 blowing through the rad and sucking from inside, one as exhaust in the rear, one attached to the HDD cage sucking from the front fan and blowing directly to the GPU and finally, the three stock 200mm, one in the front as intake and two in the top as exhaust. When im gaming i set all the coolers to the max (All of them are connected to the fan controller of the case) and i can hear them a bit through the headphones. The 4770k reaches 50c-60c during gaming sessions, about 70s in burn tests and the gpu stays between 55 and 65.
What coolers should i put as intake to replace the 200mm single fan? And those corsair AF140 doest seems to do a great job with the rad neither.