The RTX 4090 varies in size between different manufacturers, some are smaller some are bigger, however, the official Founders edition of the card from NVIDIA generally is the smallest of the bunch due to it using a much more expensive vapor chamber cooling design. The Founders edition of the 4090 is 4.48 inches in width by 11.97 inches in length and 2.38 inches in height making it the largest Founders card yet compared to previous generations of RTX graphics cards or any graphics card to be accurate. Additionally it weighs, 4.85 pounds and once installed it takes up approximately 3.25 slots. By comparison the Gigabyte version of the 4090 comes in at a whooping 5.9 inches in height (nearly 1.5 inches wider than the founders, and substantially longer at 13.39 inches in length, and its substantially thicker at 2.96 inches in height. And this will be typical of non Founders cards since they tend to use a three fan design with heat pipes and copper blocks instead of the vapor chamber as a cooling solution.