ASRock B650I Lightning WiFi AMD AM5 Mini-ITX Motherboard vs GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard,
Updated August 2026 — ASRock B650I Lightning WiFi AMD AM5 Mini-ITX Motherboard wins on form factor and memory, GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard, wins on price and power.
The ASRock B650I Lightning WiFi excels in compact design and high-speed memory support, while the GIGABYTE Z790 UD AC offers a more robust power design and better value.
Why ASRock B650I Lightning WiFi AMD AM5 Mini-ITX Motherboard is better
Compact Design
Ideal for small form factor builds
High-Speed Memory
Supports DDR5 up to 7200+ (OC)
Advanced Audio
Enhanced audio experience with Nahimic
Why GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard, is better
Lower Price
Costs $149.99 compared to $169.99
More DIMM Slots
Offers four DIMM slots for memory
Robust Power Design
16+1+1 power phases for stability
Overall score
Specifications
| Spec | ASRock B650I Lightning WiFi AMD AM5 Mini-ITX Motherboard | GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard, |
|---|---|---|
| Processor Support | AMD Ryzen 9000/8000/7000 | Intel Core 14th/13th/12th |
| Memory Type | DDR5 | DDR5 |
| Power Phases | 8+2+1 | 16+1+1 |
| M.2 Slots | 2 (PCIe 5.0 & 4.0) | 3 (PCIe 4.0) |
| Audio Codec | Realtek ALC897 | Not specified |
Dimension comparison
Overview of the ASRock B650I Lightning WiFi and GIGABYTE Z790 UD AC
The ASRock B650I Lightning WiFi is priced at $169.99, while the GIGABYTE Z790 UD AC comes at $149.99, making it about 17% cheaper than its competitor. Both motherboards are designed for high performance, but they target different processor architectures—AMD for the ASRock and Intel for the GIGABYTE. Understanding their features will help you decide which one fits your needs better.
Form Factor and Design
The ASRock B650I Lightning WiFi has an ultra-compact Mini-ITX design, measuring 170mm x 170mm, ideal for small form factor builds. This compact design is perfect for users with space constraints, ensuring that powerful computing can fit into smaller cases. In contrast, the GIGABYTE Z790 UD AC features a standard ATX form factor, which allows for more expansion slots and additional features but requires a larger case. The choice of form factor can significantly impact your build's aesthetics and spatial efficiency, depending on your setup.
Processor Compatibility
The ASRock B650I Lightning WiFi supports AMD Ryzen 9000, 8000, and 7000 series processors, providing a future-proof solution for users committed to AMD. On the other hand, the GIGABYTE Z790 UD AC is compatible with Intel Core 14th, 13th, and 12th generation processors. This distinction is crucial for gamers and professionals looking to optimize their systems for specific tasks, as the performance can vary significantly between AMD and Intel architectures. Choosing the right compatibility is fundamental to achieving your desired processing power.
Memory Support
When it comes to memory, the ASRock B650I Lightning WiFi supports dual-channel DDR5 DIMM slots optimized for speeds up to 7200+ (OC). This capability is particularly advantageous for enthusiasts looking to push their systems to the limit. In comparison, the GIGABYTE Z790 UD AC also supports dual-channel DDR5 but has four DIMM slots. While both motherboards offer robust memory options, the ASRock's emphasis on high-speed overclocking may appeal to those looking for maximum performance.
Power Design and Stability
The ASRock B650I Lightning WiFi boasts an advanced power delivery system with an 8+2+1 phase power design, which ensures exceptional stability and efficiency. The use of premium Dr.MOS components enhances its reliability during intensive tasks. Conversely, the GIGABYTE Z790 UD AC features a more robust 16+1+1 twin hybrid phases digital power design with 60A DrMOS, which is especially beneficial for users who plan to overclock their Intel processors. The difference in power design can be pivotal for users aiming for high performance, particularly in demanding applications.
Connectivity Options
Both motherboards are equipped with modern connectivity options, but they cater to slightly different needs. The ASRock B650I Lightning WiFi includes features like 2.5G LAN and Intel WiFi 6E, which provide fast and reliable internet connectivity along with multiple USB 3.2 Gen2 ports. The GIGABYTE Z790 UD AC, however, also supports dual-band WiFi and has advanced USB connectivity options like USB-C 3.2 Gen 2x2. Users who prioritize connectivity will find both motherboards offer excellent options, though the choice may depend on whether you prefer wired or wireless solutions.
Storage Capabilities
In terms of storage, the ASRock B650I Lightning WiFi features a blazing M.2 PCIe 5.0 x4 slot along with dual M.2 slots (PCIe 5.0 & PCIe 4.0) and two SATA3 ports. This setup allows for a flexible and fast storage configuration, which is essential for users who need quick data access. The GIGABYTE Z790 UD AC also offers triple NVMe PCIe 4.0 x4 M.2 slots, providing ample storage possibilities. Both motherboards excel in this area, but the ASRock’s PCIe 5.0 support may offer a future-proof advantage for high-speed storage solutions.
Audio Experience
Audio performance can often be overlooked in motherboard comparisons, but both models provide enhanced sound capabilities. The ASRock B650I Lightning WiFi features Realtek ALC897 7.1 CH HD Audio Codec, enhanced with Nahimic Audio for an immersive experience. Meanwhile, the GIGABYTE Z790 UD AC’s audio capabilities are not explicitly detailed, but its comprehensive thermal design indicates a focus on maintaining audio quality under load. Users who prioritize high-quality audio may find the ASRock's dedicated enhancements appealing.
Which should you buy?
Choosing between the ASRock B650I Lightning WiFi and the GIGABYTE Z790 UD AC ultimately depends on your specific needs and preferences. If you're looking for a compact motherboard with cutting-edge features for AMD processors, the ASRock B650I Lightning WiFi at $169.99 offers excellent performance in a small package. However, if you prefer Intel processors and want a more cost-effective option at $149.99, the GIGABYTE Z790 UD AC provides a robust solution with excellent connectivity and power design. Consider your processor preference, form factor, and specific feature requirements to make the best choice for your build.

