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Overclocking

Seven AMD 785G-Based Motherboards Rounded Up
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Let's have a look at the different BIOS controls on each board:

BIOS Frequency and Voltage Settings (for overclocking)
                        
ASRock M3A785GXH
/128M
ASUS
M4A785TD-V EVO

Biostar
TA785GE 128M

Foxconn
Cinema Premium

CPU Ref Clock
150-500 MHz (1 MHz)
200-550 (1 MHz)
200-600 (1 MHz)
190-600 (1 MHz)
CPU Multiplier
Yes
Yes
No
Yes
mGPU Clock
350-2000 MHz (1 MHz)
150-2000 MHz (1 MHz)
150-1200 MHz (1 MHz)
150-2020 MHz (1 MHz)
SidePort Mem Clock
533-1700 MHz (steps)
667-1000 MHz (steps)
333-533 MHz (steps)
N/A
DRAM Data Rates
800/1066/1333/1600
800/1066/1333/1600
400/533/667/800/1066
400/533/667/800/1066
PCIe Clock
75-250 MHz (1 MHz)
100-150 MHz (1 MHz)
None
90-250 MHz (1 MHz)
CPU Vcore
0.60-1.4875V (0.125V)
1.00-1.7V (0.00625V)
0.05-1.45V (0.05V)
+250-775mV (25mV)
785G Core
0.6-1.4875V (0.0125V)
1.10-1.61V (0.015V)
0.05-1.45V (0.05V)
+300-360mV (30mV)
SB710 Core
None
None
1.2-1.5V (0.1V)
+300-360mV (30mV)
mGPU Voltage

None
None
See 785G Core
SidePort Voltage
1.5-1.8V (0.1V)
1.5-1.7V (0.1V)
1.8-2.1V (0.1V)
N/A
DRAM Voltage
1.48-2.4V (~0.05V)
1.5-2.31V (0.015V)
1.95-2.65V (0.1V)
+500-600mV (50mV)
Command Rate
1T-2T
None
1T-2T
1T-2T
CAS Latency
4-12 Cycles
4-12 Cycles
3-7 Cycles3-7 Cycles
tRCD
5-12 Cycles
5-12 Cycles
3-6 Cycles5-12 Cycles
tRP
5-12 Cycles
5-12 Cycles
3-6 Cycles5-12 Cycles
tRAS
15-22 Cycles
15-30 Cycles
15-30 Cycles
15-30 Cycles
BIOS Frequency and Voltage Settings (for overclocking)
                        
Gigabyte
GA-MA785GT
-UD3H
ECS
A785GM-M

MSI
785GM-E65

CPU Ref Clock
200-500 MHz (1 MHz)190-400 MHz (1 MHz)
190-400 MHz (1 MHz)
CPU Multiplier
Yes
Yes
Yes
mGPU Clock
200-2000 MHz (1 MHz)150-1200 MHz (1 MHz)
200-999 MHz (1 MHz)
SidePort Mem Clock
N/AN/A
1066/1333/1600/1700
DRAM Data Rates
800/1066/1333/1600800/1066/1333/1600
800/1066/1333/1600
PCIe Clock
100-200 MHz (1 MHz)None
100-150 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 Voltage
NoneNone
None
SidePort Voltage
N/AN/A
None
DRAM Voltage
+0.05-0.75V (0.05V)+0.001-0.063V (steps)
1.55-2.42V (~0.1V)
Command Rate
1T-2T
None1T-2T
CAS Latency
4-12 Cycles
4-12 Cycles
4-12 Cycles
tRCD
5-12 Cycles
5-12 Cycles
5-12 Cycles
tRP
5-12 Cycles
5-12 Cycles
5-12 Cycles
tRAS
15-30 Cycles15-30 Cycles
Auto


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.

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