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Seven AMD 785G-Based Motherboards Rounded Up

Overclocking

Let's have a look at the different BIOS controls on each board:

BIOS Frequency and Voltage Settings (for overclocking)
ASRock M3A785GXH/128MASUSM4A785TD-V EVOBiostarTA785GE 128MFoxconnCinema Premium
CPU Ref Clock150-500 MHz (1 MHz)200-550 (1 MHz)200-600 (1 MHz)190-600 (1 MHz)
CPU MultiplierYesYesNoYes
mGPU Clock350-2000 MHz (1 MHz)150-2000 MHz (1 MHz)150-1200 MHz (1 MHz)150-2020 MHz (1 MHz)
SidePort Mem Clock533-1700 MHz (steps)667-1000 MHz (steps)333-533 MHz (steps)N/A
DRAM Data Rates800/1066/1333/1600800/1066/1333/1600400/533/667/800/1066400/533/667/800/1066
PCIe Clock75-250 MHz (1 MHz)100-150 MHz (1 MHz)None90-250 MHz (1 MHz)
CPU Vcore0.60-1.4875V (0.125V)1.00-1.7V (0.00625V)0.05-1.45V (0.05V)+250-775mV (25mV)
785G Core0.6-1.4875V (0.0125V)1.10-1.61V (0.015V)0.05-1.45V (0.05V)+300-360mV (30mV)
SB710 CoreNoneNone1.2-1.5V (0.1V)+300-360mV (30mV)
mGPU VoltageNoneNoneSee 785G Core
SidePort Voltage1.5-1.8V (0.1V)1.5-1.7V (0.1V)1.8-2.1V (0.1V)N/A
DRAM Voltage1.48-2.4V (~0.05V)1.5-2.31V (0.015V)1.95-2.65V (0.1V)+500-600mV (50mV)
Command Rate1T-2TNone1T-2T1T-2T
CAS Latency4-12 Cycles4-12 Cycles3-7 Cycles3-7 Cycles
tRCD5-12 Cycles5-12 Cycles3-6 Cycles5-12 Cycles
tRP5-12 Cycles5-12 Cycles3-6 Cycles5-12 Cycles
tRAS15-22 Cycles15-30 Cycles15-30 Cycles15-30 Cycles
BIOS Frequency and Voltage Settings (for overclocking)
GigabyteGA-MA785GT-UD3HECSA785GM-MMSI785GM-E65
CPU Ref Clock200-500 MHz (1 MHz)190-400 MHz (1 MHz)190-400 MHz (1 MHz)
CPU MultiplierYesYesYes
mGPU Clock200-2000 MHz (1 MHz)150-1200 MHz (1 MHz)200-999 MHz (1 MHz)
SidePort Mem ClockN/AN/A1066/1333/1600/1700
DRAM Data Rates800/1066/1333/1600800/1066/1333/1600800/1066/1333/1600
PCIe Clock100-200 MHz (1 MHz)None100-150 MHz (1 MHz)
CPU Vcore+/-0.025-0.6V (0.025V)0.8-1.550V (0.025V)0.988-1.976V (0.001V)
785G Core+0.1-0.3V (0.1V)+0.005-0.315V (0.005V)1.108-1.337V (~0.023V)
SB710 Core+/-0.025-0.6V (0.025V)1.2-1.35V (.05V)1.228-1.472V (~0.023V)
mGPU VoltageNoneNoneNone
SidePort VoltageN/AN/ANone
DRAM Voltage+0.05-0.75V (0.05V)+0.001-0.063V (steps)1.55-2.42V (~0.1V)
Command Rate1T-2TNone1T-2T
CAS Latency4-12 Cycles4-12 Cycles4-12 Cycles
tRCD5-12 Cycles5-12 Cycles5-12 Cycles
tRP5-12 Cycles5-12 Cycles5-12 Cycles
tRAS15-30 Cycles15-30 CyclesAuto

Let's see how well these boards overclocked the integrated 785G graphics core compared to one another:

We checked the mGPU overclock at 100 MHz steps in order to get a general idea of how well these boards might perform. It seems even the least cooperative sample made it to 800 MHz, for a 60% overclock. The best result was 1,000 MHz, which represents a 100% overclock. If only discrete cards would show us these kind of gains. Let's see how this translates to actual performance:

The highest results come from the highest overclocks, except for the Gigabyte board, which made it to 1,000 MHz but lacks the SidePort memory to really take advantage of this boost. Note that the MSI board surpassed the Foxconn and ECS platforms even though they sported higher overclocks (attributable, perhaps, to highly overclocked SidePort memory). With every board, the overclock enables a massive boost at 1024x768, going from the verge of playable to quite comfortable.