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BIOS and Overclocking

790i Ultra SLI Motherboards Compared

BIOS Frequency and Voltage settings (for overclocking)
FSB Data Rate FSB-400 to FSB-3000 MHz (1 MHz)
Clock Multiplier Adjustment Yes
DRAM Linked Ratios Automatic, 1:1, 5:4, 3:2
DRAM Unlinked Data Rate DDR3-400 to DDR3-2500
PCIe Clock 100 to 200 MHz (1 MHz)
CPU Vcore 0.51250 to 2.00000 Volts (0.00625 Volts)
CPU FSB Voltage 1.20 to 1.55 Volts (0.05 Volts)
Northbridge (SPP) 1.30 to 1.55 Volts (0.05 Volts)
Southbridge (MCP) 1.50 to 1.75 Volts (0.05 Volts)
DRAM Voltage 1.50 - 2.275 Volts (0.025 Volts)
CAS Latency Range tCAS: 5-11; tRCD: 1-15; tRP: 1-15; tRAS: 1-63

XFX nForce 790i Ultra BIOS settings offer a little broader frequency range than most previous-generation products, but the improvements are comparable to current third-party designs from Asus and MSI. Nvidia’s scarcity of manually-selectable “linked” memory ratios comes back over and over again.

The deceptively-named System Clocks BIOS menu provides only PCI-Express and HyperTransport Interconnect frequency adjustments, otherwise focusing on bus multipliers.

FSB and Memory clock speeds are found within the FSB & Memory Config menu. This is also where the memory timing sub-menu link appears.

Memory timings are adjustable to all reasonable settings, allowing top performance at any reasonable memory speed.

Voltage settings are a little more conservative, but broad enough to take most hardware to its limit.

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