AMD's 785G Chipset Boards: 780G Evolved

CPUs|Motherboards
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Comparisons (Stock Speeds)

Comparison (X3 720 @ 2.8 GHz, C&Q)
Test State
M4A785TD-V
M4A78T-E
785GM-E65
Idle
N/A
56W
N/A
54W
N/A
44W
Rush Hour
(H.264)
10%
~62W
7%
~57W
9%
~52W
Coral Reef
(WMV-HD)
30%
~73W
21%
~64W
28%
~68W
Drag Race
(VC-1)
40%
~89W
35%
~71W
40%
~78W
Disturbia
(Blu-ray H.264)
15%
~71W
20%
~70W
16%
~57W
CPU Load
N/A
123W
N/A
117W
N/A
121W
CPU + GPU
Load
N/A
133W
N/A
135W
N/A
130W

The 790GX-based Asus M4A78T-E had slightly lower CPU usage than the 785G boards during our WMV-HD clip, though 7-9% isn't enough of a difference to consider the result anything but an anomaly. We weren't able to detect any difference between the HD 3300 and HD 4200 graphics in regards to video playback.

The M4A785TD-V is the least energy efficient AM3 board we've tested, using 12W more idle, 5-14W more during video playback, and a 2-3W more during full load compared to its MSI counterpart. The M4A78T-E fared poorly in idle power like the M4A785TD-V, but used 4-6W less than the 785G boards during CPU load only. Most of the other results fell in-between.

The 785GM-E65 uses a 4+1 phase array in its VRMs, while the M4A785TD-V has a 8+2 phase design. That would seem to indicate that the MSI board is more suited for low-load systems while the Asus is more efficient when paired with a higher power CPU, though this was not the case when we pushed our 95W X3 720 to the brink on both boards. The 785GM-E65 also has "active phase switching" which adjusts the phases used by the board's VRMs depending on CPU load. The M4A785TD-V, like most Asus boards has a similar feature called EPU though all it seems to do is make minor adjustments to various operating voltages which results in only slight energy savings.

Comparison (Underclocked, Undervolted)

Comparison (X3 720 @ 1.6GHz, best undervolt)
Test State
M4A785TD-V (1.025V)
M4A78T-E (0.9125V)
785GM-E65 (0.940V)
Idle
N/A
59W
N/A
50W
N/A
45W
Rush Hour
(H.264)
5%
~64W
3%
~56W
4%
~52W
Coral Reef
(WMV-HD)
37%
~65W
22%
~56W
35%
~55W
Drag Race
(VC-1)
44%
~67W
40%
~58W
44%
~56W
Disturbia
(Blu-ray H.264)
9%
~69W
23%
~61W
9%
~57W
CPU Load
N/A
74W
N/A
63W
N/A
62W
CPU + GPU
Load
N/A
84W
N/A
82W
N/A
72W

The M4A785TD-V used the most power when undervolted to the lowest stable voltage with our processor running at 1.6 GHz, though it we weren't able to lower it below 1.025V due to the BIOS. In any regard, it drew 14W more when idle and 10-12W more during video playback and CPU/GPU load compared to the MSI 785GM-E65. The 790GX-based M4A78T-E used only slightly more than the MSI board, 5W at most during most of our test states, but during full system load, it used 10W more, 2W less than the M4A785TD-V.



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