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I'm going to possibly buy a 650D - I have just purchased my H90 since it's 50 bucks right now. Would anyone help me understand how air pressure works in these cases? From what I have gathered, I need to replace some of the fans in this case with the fans attached to the H90?

And will 1x 780 (Or 290 non ref) mess up the air pressure? How about 2x?

Here's the build for full reference:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4820K 3.7GHz Quad-Core Processor (Purchased For $269.99)
CPU Cooler: Corsair H90 94.0 CFM Liquid CPU Cooler (Purchased For $49.99)
Motherboard: Gigabyte GA-X79-UP4 ATX LGA2011 Motherboard (Purchased For $174.99)
Memory: G.Skill Ripjaws X Series 16GB (2 x 8GB) DDR3-1866 Memory (Purchased For $127.50)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk (Purchased For $89.99)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive (Purchased For $84.99)
Video Card: EVGA GeForce GTX 780 3GB Video Card ($530.91 @ Newegg)
Case: Corsair 650D ATX Mid Tower Case ($129.99 @ Newegg)
Power Supply: SeaSonic Platinum 860W 80+ Platinum Certified Fully-Modular ATX Power Supply (Purchased For $129.99)
Optical Drive: LG GH24NS95 DVD/CD Writer ($15.00 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (Purchased For $14.99)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($35.00)
Total: $1653.33
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-13 23:39 EST-0500)

Also - seeing as I have purchased everything except the Case - would you suggest a diff case for me? ((The CPU cooler is still packing atm so i could cancel that, but not sure ill find better at 50 bucks)