The PCI slot fans only require an open slot to screw into the rear of the case.
The Antec 900 has 7 rear slots, if your GPUs are dual slots that still leaves 3 open slots, unless you are using other PCI devices.
It may just take some hunting around to find ones that draw air from both sides.
There are a lot of 120mm fans out there that have great air-flow.
Scythe, Noctua, and Nexus/Yate-Loon make some of the best.
Software that will look at what in a more human perspective?
As to the Antec Spot Cool:
Originally Posted by Review in my last post
Installation is clean and easy; the end of the Antec Spot Cool is installed by a screw pass-through -- which can share a mounting hole with your motherboard.
The fan on its circular frame can also be rotated to control air direction. This will permit maximum flexibility of effective use.
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X