How do I know if a GPU will fit in a case?

ThetaPro

Honorable
May 14, 2013
9
0
10,510
I was going to buy a coolermaster haf 922, if I was to get a 7970, or specifically the larger vapor-x version of it would it fit? I've tried comparing dimensions but I'm not sure if the case size listed is the inside or outside of the case? Here is my current build, the budget is flexible so if I need a bigger case i can get one.

PCPartPicker part list /

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($169.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($27.99 @ Newegg)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($124.99 @ Microcenter)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Newegg)
Storage: Samsung 840 Pro Series 128GB 2.5" Solid State Disk ($129.99 @ Adorama)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($129.99 @ Amazon)
Video Card: Sapphire Radeon HD 7970 GHz Edition 3GB Video Card ($433.98 @ SuperBiiz)
Case: Cooler Master HAF 922 ATX Mid Tower Case ($89.99 @ Amazon)
Power Supply: Corsair Enthusiast 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($94.98 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.99 @ Microcenter)
Total: $1286.88