Fractal Design Define R5 (with a window) fans configuration

[VeljkoCG]

Hey guys, how should I set up my fans and do I need more than two? I got my R5 with a one back fan and one front fan it also has a "ModuVents" system which allows me to place more fans on the top of the case.

So this is the build:
 

CPU: INTEL Core i7-5820K 3.30GHz 2011-3 BOX

CPU COOLER: Noctua NH-D15
MOTHERBOARD: ASUS X99-A
RAM: 4x HyperX 8GB Fury DDR4 2666MHz CL15 HX424C15FB/8
HDD: WD Black 2TB 7200rpm 64MB SATA3
SSD: SAMSUNG 850 PRO 256GB
GPU: GIGABYTE GV-N970G1 GAMING-4GD GTX970 4GB GDDR5 OC PCIE

PSU: EVGA G2 750W

[Guest]

-snip-

If you remove the moduvents you are killing the silence

the fans that come included are fine, temps arent too much of a problem with that case.

[LogicalDrm]

I would get one extra and have 2 in (front) and 1 out (rear). You can also test without rear since D15 will blow towards rear anyway.

[darksoul43]

this is pretty much the exact config im going with except ill be gettting a strix 980ti, im planning to get the same cpu cooler, and either getting noctua a14s in the front and rear and making a fan curve but ill test fractals fans first

[Ottawa_Brewer]

I have the same case. I'm running the stock fan setup with one extra GP-14 in the front. I'm not taking off the moduvents because it reduces the sound-dampening and destroys the aesthetics.