LodisKnight. How do you like the 100mm fan upgrade? Did you get the idea from this thread?
https://smallformfactor.net/forum/threads/noctua-nh-l9-easy-10-100mm-fan-upgrade.984/
I also mounted a 120mm fan directly over the Noctua but it requires VLP Ram and an adapter.
Also, I don't think it cools as well as the Kaze 100mm. I think that may be the sweet spot. Plus it looks amazing and you can do it with stock RAM.
I'm really digging the fan over the GPU!
How much space do you have between the back of the GPU and the Scythe 120mm?
*Do you think a 14-15mm fan would work there or does it need to be 12mm or less?
I'm loving the 100mm fan upgrade. I've never seen that link, but it's not the same fan. I REALLY wanted a PWM fan for the CPU cooler, otherwise the efficiency of the fan would be compromised. It came at a price, though. I had to purchase the entire Scythe Shuriken Heatsink JUST to get the fan. Three emails to Scythe fell on blind eyes, I guess. I couldn't go with the 120mm over the CPU because I am going to be using the RGB edition of the G.Skill Trident Z 4266 MHz RAM.
I went this route because I'm going for a black/red build unwaveringly. Want it to match my children's school colors. (see profile pic)
As far as whether or not a 14/15mm fan would work, I would say not in the way I implemented. The rubber feet I used bridge the entire gap so that the fan is perfectly flush with the top of the case. Without them, you would need to find a way to stabilize the "not-screwed-in" portion of the fan. Otherwise, unless the 14/15mm fan you put in it EXACTLY touches the GPU and top of the case equally. If it doesn't and you don't have some sort of noise-dampening solution for the space, there could be a rattle.