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GIGABYTE uses a modified version of the Phoenix Award BIOS on their 870A-UD3 board. The main screen is split into the MB Intelligent Tweaker where the overclocking on the board is done, Standard CMOS Features, Advanced BIOS Features, Integrated Peripherals, and PC Health Status. Standard CMOS Features is where the Date, Time, hard drives and total system memory detected are displayed.
 Dual BIOS
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Advanced BIOS Features is where the CPU Features are enabled or disabled including AMD C1E Support, Virtualization, K8 Cool & Quiet, CPU Unlock, CPU Core control. Here is also where you set the boot device priority, the password check, the HDD SMART Capability, and the Init Display First. CPU Unlock works with CPUs that have disabled cores (2, 3, or 4 core CPUs that have 4 or 6 cores inside).
The Integrated Peripherals menu is where you set the SATA Controller Type and SATA Type. Here is also where you enable SATA 3.0 Support, the GSATA and ESATA controllers. The LAN, Audio, Firewire, USB 3.0, USB Legacy and USB Storage functions are all set here. Note that since I could not get RAID 0 to work on this board after a few different attempts, all tests were run in AHCI mode set in this menu.
The MIT or Motherboard Intelligent Tweaker is where the tweaking is done in the BIOS. Here you can set the CPU Clock Ratio, the NB Frequency, the CPU Host Clock Control, the PCIE Clock, the HT Link Frequency, the Memory Clock, the DRAM Configuration, and the System Voltages. I have compiled a chart outlining the various settings in the BIOS below:
| Setting | Range |
| CPU Clock Ratio | Dependent on CPU |
| CPU NB Frequency | Dependent on CPU |
| CPU Host Clock Control | Auto, Manual |
| CPU Frequency | 200-500MHz |
| PCIE Clock | 100-150 |
| HT Link Frequency | 200-2GHz |
| Memory Clock | X4, x5.33, x6.66, x8 |
| DCTs mode | Ganged, Unganged |
| DDR3 Timing items | |
| CAS# latency | 4T-12T |
| RAS to CAS R/W Delay | 5T-12T |
| Row Precharge Time | 5T-12T |
| Minimum RAS Active Time | 15T-30T |
| 1T/2T Command Timing | 1T,2T |
| TwTr Command Delay | 4T-7T |
| Trfc0 for DIMM1 | 90ns, 110ns, 160ns, 300ns, 350ns |
| Trfc2 for DIMM2 | 90ns, 110ns, 160ns, 300ns, 350ns |
| Trfc1 for DIMM3 | 90ns, 110ns, 160ns, 300ns, 350ns |
| Trfc3 for DIMM4 | 90ns, 110ns, 160ns, 300ns, 350ns |
| Write Recovery Time | 5T-8T, 10T, 12T |
| Precharge Time | 4T-7T |
| Row Cycle time | 11T-42T |
| RAS to RAS Delay | 4T-7T |
| DRAM Voltage control | 1.500v-2.400v |
| NB Voltage Control | 1.100v-1.800v |
| NB PCIE Voltage control | 1.800v-2.200v |
| CPU NB VID Control | Dependent on CPU |
| CPU Voltage Control | Dependent on CPU
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Bios Screenshots
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 BIOS shots  BIOS shots  BIOS shots  BIOS shots
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