ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA vs GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard,
Updated July 2026 — GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard, leads on price and thermals.
The GIGABYTE Z790 UD AC offers superior performance and features compared to the ASRock B450M/AC, making it the better choice for high-end users.
Why ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA is better
Price
ASRock B450M/AC is significantly cheaper.
Basic Features
Adequate for budget builds.
AMD Compatibility
Supports a wide range of AMD processors.
Why GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard, is better
Performance
GIGABYTE Z790 UD AC supports DDR5.
Expansion
More PCIe slots and M.2 support.
Thermal Management
Superior thermal design for high performance.
Overall score
Specifications
| Spec | ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA | GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard, |
|---|---|---|
| Socket | AM4 | LGA 1700 |
| Memory Type | DDR4 | DDR5 |
| PCIe Version | 3.0 | 5.0 |
| M.2 Slots | 1 | 3 |
| Power Phases | 4 | 16+1+1 |
Dimension comparison
Overview of the ASRock B450M/AC and GIGABYTE Z790 UD AC
The ASRock B450M/AC is priced at $79.00, making it about 47% cheaper than the GIGABYTE Z790 UD AC, which costs $149.99. This significant price difference sets the stage for a comparison between two very different motherboards aimed at distinct segments of the market. The ASRock B450M/AC caters to users looking for a budget-friendly option with solid specifications for AMD processors, while the GIGABYTE Z790 UD AC is designed for those seeking top-tier performance for Intel's latest generations.
Compatibility and Processor Support
The ASRock B450M/AC supports AMD AM4 Socket Ryzen processors, including the 2000, 3000, 4000 G-Series, and 5000 series, providing a wide range of compatibility for AMD users. In contrast, the GIGABYTE Z790 UD AC is tailored for Intel's LGA 1700 socket and supports the 12th, 13th, and 14th Gen Intel Core processors. This difference in compatibility means that if you have a preference for AMD or Intel, your choice of motherboard is essentially dictated by your processor selection.
Memory and Performance
The ASRock B450M/AC supports DDR4 memory with a maximum speed of 3200 MHz, which is adequate for many gaming and productivity tasks. On the other hand, the GIGABYTE Z790 UD AC is compatible with DDR5 memory, offering dual-channel support across four DIMMs. This represents a significant advantage for the GIGABYTE model, as DDR5 technology provides faster data rates and enhanced performance capabilities, making it a better choice for high-performance computing and gaming.
Expansion and Connectivity Options
When it comes to expansion, the ASRock B450M/AC features one PCIe 3.0 x16 and one PCIe 2.0 x16 slot, allowing for basic expansion capabilities. In comparison, the GIGABYTE Z790 UD AC offers a more robust configuration with PCIe 5.0 support and three M.2 slots, which allows for faster storage and greater versatility in terms of additional components. This makes the GIGABYTE motherboard a more future-proof option for gamers and professionals who may want to upgrade their systems down the line.
Thermal Management and Durability
The GIGABYTE Z790 UD AC excels in thermal management with its comprehensive thermal design, which includes fully covered MOSFET heatsinks and M.2 thermal guards. This ensures that the motherboard can handle high performance without overheating. The ASRock B450M/AC lacks such advanced thermal features, which could limit its performance under heavy loads. For users who plan on overclocking or running demanding applications, the GIGABYTE's superior thermal management may provide a significant benefit.
Price Point and Value
At $79.00, the ASRock B450M/AC offers a compelling value for those on a budget, allowing entry into the AMD ecosystem without a hefty investment. Conversely, the GIGABYTE Z790 UD AC, priced at $149.99, reflects its advanced features and compatibility with cutting-edge technology. While the price difference is substantial—about $70—the investment in the GIGABYTE motherboard may be justified for users looking for long-term performance and upgrade potential.
Aesthetic and Design Features
The overall aesthetic and design features of the GIGABYTE Z790 UD AC include RGB Fusion support, which allows users to customize lighting effects and enhance the visual appeal of their builds. The ASRock B450M/AC, while functional, does not emphasize aesthetics to the same extent. For users who value the look of their PC build, the GIGABYTE motherboard provides more options for personalization and style.
Which should you buy?
Choosing between the ASRock B450M/AC and the GIGABYTE Z790 UD AC ultimately depends on your specific needs and budget. If you're seeking a cost-effective option for an AMD setup and don’t require the latest features, the ASRock B450M/AC is a solid choice at $79.00. However, if performance, advanced features, and future-proofing are your primary concerns, the GIGABYTE Z790 UD AC at $149.99 offers superior technology and capabilities that may be well worth the investment.

