Do you think using fan to take colder air from outside will work. I am talking about two GPU cooling at bottom of case (fan are below of radiators sucking air from under PC case. The other option will be to reverse fans to pool air thru video card's radiators outside of case which will be bottom.
Case - NZXT Phantom 820 black
Motherboard - Asus X99 Deluxe 3.1
CPU - i7 5930k (OC to 4.5 Ghz)
Memory - 32GB Geil (4x 8GB) DDR4 3000 MHz (Timing 15-15-15-35) OC to LPX XMP 2666
CPU cooler - Corsair H100 GTX
Power supply - EVGA SuperNOVA 1000 P2 80 PLUS PLATINUM Certified 1000W
Operating system - Windows 10 PRO 64bit
Primary HD for Operating system - SAMSUNG 850 EVO MZ-75E1T0B/AM 2.5" 1TB SATA III 3-D Vertical Internal Solid State Drive (SSD)
Storage HD - WD BLACK SERIES WD4003FZEX 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
Video card - EVGA GTX 980ti Hybrid 2-way SLI
Monitor - Overlord Tempest X270OC, 27" 120 Hz IPS (set to 100 Hz)
http://oi57.tinypic.com/sowqki.jpg
http://oi59.tinypic.com/vx25tw.jpg
Case - NZXT Phantom 820 black
Motherboard - Asus X99 Deluxe 3.1
CPU - i7 5930k (OC to 4.5 Ghz)
Memory - 32GB Geil (4x 8GB) DDR4 3000 MHz (Timing 15-15-15-35) OC to LPX XMP 2666
CPU cooler - Corsair H100 GTX
Power supply - EVGA SuperNOVA 1000 P2 80 PLUS PLATINUM Certified 1000W
Operating system - Windows 10 PRO 64bit
Primary HD for Operating system - SAMSUNG 850 EVO MZ-75E1T0B/AM 2.5" 1TB SATA III 3-D Vertical Internal Solid State Drive (SSD)
Storage HD - WD BLACK SERIES WD4003FZEX 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
Video card - EVGA GTX 980ti Hybrid 2-way SLI
Monitor - Overlord Tempest X270OC, 27" 120 Hz IPS (set to 100 Hz)
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http://oi57.tinypic.com/sowqki.jpg
http://oi59.tinypic.com/vx25tw.jpg