Man, I must be getting on Aibohphobia's nerves with my questions. Guess who's back with more water-cooling inquiries.
I believe the FTW uses a reference length PCB so you could either mount the radiator to the front of the case or the bottom. Here's an Alphacool ST30 mounted to the front:
On post #8 (page 1), there is a picture of two reference cards in SLI, with an Alphacool ST30 mounted to the front. Now, the ST30's thickness is 30mm, and the radiator I was looking at, the EK-CoolStream SE 240, has a thickness of 26mm. I plan on using 2 EK-Vardar F4-120ER PWM fans. If I put 2 Titan X (Pascal) cards under water and in SLI, I guess I would have room for this radiator setup, correct?
Now, looking at the gap between the lower graphics card and the bottom of the case, would there be enough room for another EK-CoolStream SE 240?
PCI slots are 20.32mm tall so subtract that from the measurement if you're talking about the 5th slot.
Also, all dimensions are rounded down.
Again, the thickness of the EK-CoolStream SE 240 is 26mm. Since the graphics cards are under water, I can stuff them close to each other, allowing me to use the ~43mm of space beneath it. That means I have ~17mm for a fan, forcing me to use a slim fan. My other option is to use an ~18mm radiator (which I have never seen) and a 25mm fan.
Also, side note: in the first image, would I be able to fit a tiny pump/reservoir combo in the space between the hard drive (which in my build would be an ATX PSU) and the radiator? I would use a terminal block for multi-GPUs to solve any (flexible) tubing run problems.