GIGABYTE X299 UD4 Pro DDR4 Intel Motherboard

The Gigabyte X299 UD4 Pro is an ATX-form-factor motherboard built around the Intel X299 Express Chipset, designed to seat Intel Core X-series processors in the LGA2066 package. Its ATX board measures 30.5 cm × 24.4 cm, making it compatible with standard full-tower and mid-tower cases that support ATX layouts. Memory expandability is a headline strength. The board provides eight DDR4 DIMM slots that can be populated with up to 128 GB of unbuffered system memory in quad-channel configuration when paired with a 44-lane or 28-lane CPU. Four-core (16-lane) CPUs activate only four slots in dual-channel mode, supporting up to 64 GB. XMP profiles are supported, and the board accepts a wide range of DDR4 frequencies from 2133 MHz up to 4400 MHz (the higher speeds require overclocking). For expansion, five full-length PCIe 3.0 slots are provided: two running at x16 bandwidth, one at x8, and two at x4. This layout enables NVIDIA Quad-GPU SLI or AMD Quad-GPU CrossFire configurations — three-way GPU setups are achievable with 44-lane CPUs, while two-way SLI works with both 44-lane and 28-lane processors. Storage options include two M.2 Socket 3 connectors (PCIe Gen3 x4 / SATA), eight SATA 6 Gb/s ports, and RAID 0, 1, 5, and 10 support. Connectivity is handled by Intel Gigabit Ethernet paired with cFosSpeed traffic-shaping software, while USB ports include two rear-panel USB 3.1 Gen 2 Type-A ports (via ASMedia controller), six rear USB 3.1 Gen 1 ports, plus additional internal headers for front-panel USB. Audio is served by a Realtek ALC1220 codec rated at 120 dB SNR output and 114 dB SNR recording, with Smart Headphone Amp and hardware DSD128 decoding. Thermal management is handled by the Smart Fan 5 system, which supports multiple temperature sensors, hybrid PWM/voltage fan headers, and a dedicated 3 A pump header for liquid-cooling setups. RGB Fusion provides onboard digital LED and RGBW strip header support with individually addressable LEDs. The BIOS uses Gigabyte's DualBIOS implementation — two physical 128 Mbit flash chips — offering backup recovery if the primary BIOS is corrupted. ESD protection is rated to 25 kV and LAN surge protection to 15 kV according to Gigabyte's published specifications. VERIFIED SPECIFICATIONS • Socket: LGA2066 • Chipset: Intel X299 Express • Form Factor: ATX (30.5 cm × 24.4 cm) • Memory: 8 × DDR4 DIMM, up to 128 GB (quad-channel); DDR4 2133–4400 MHz (higher speeds O.C.) • Expansion: 2 × PCIe 3.0 x16, 1 × PCIe 3.0 x8, 2 × PCIe 3.0 x4 • Storage: 2 × M.2 (PCIe Gen3 x4/SATA), 8 × SATA 6 Gb/s; RAID 0/1/5/10 • USB (rear): 2 × USB 3.1 Gen 2 Type-A, 6 × USB 3.1 Gen 1 • Audio: ALC1220, 120 dB SNR • LAN: Intel GbE + cFosSpeed • BIOS: AMI UEFI, DualBIOS (2 × 128 Mbit) • OS Support: Windows 10 64-bit • Warranty: 3 Years