Some motherboards can accommodate two RTX 3090 graphics cards simultaneously.
Some motherboards can accommodate two RTX 3090 graphics cards simultaneously.
You're looking for a motherboard that can accommodate two large RTX 3090 graphics cards. You should check if the board supports high-density PCIe slots and has enough space around them for the cards to fit comfortably. Also, verify whether the manufacturer provides guidelines on the minimum distance between PCI slots to ensure proper airflow and stability.
PCIe slot distances follow a standard. Most GPUs indicate whether they're 2-slot or 3-slot coolers, so check reviews or specs accordingly. Ensure your motherboard offers sufficient space for your x16 slots. For extreme setups, consider a Threadripper system supporting up to four GPUs, though it will cost more. RTX 3080 and 3090 offer similar performance (perhaps a 10% difference), but the 3080s are generally more affordable. For top-tier workstations, look at options like this: https://www.amazon.com/ASUS-Z690-Creator...B09K92GRQF
For tailored suggestions, consider the platform you're using. You should opt for an HEDT configuration like Threadripper or a board with x8/x8 connectivity. PCIe speed matters especially for rendering, and on consumer systems you typically have limited PCIe lanes. A board that can divide those 16 lanes into eight per GPU will boost performance, though it’s not essential. If using Intel, budget-friendly options include the Z690 Carbon, Z690 Aero D, and Z690 Taichi. Each has advantages and drawbacks—Aero D offers superior cooling spacing but poor memory support and eATX form factor. The Taichi provides fewer rear USB ports but includes Thunderbolt and is generally more affordable than the Carbon and Aero D. The Carbon remains a reliable choice, though its PCIe layout may cause GPUs to overheat. On AMD, availability depends on price; currently, the B550 Taichi stands out as the most sensible due to its lower cost compared to other strong options, despite its less ideal PCIe design for dual 3090s.