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Comparisons (Stock Speeds)
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Comparison (X3 720 @ 2.8 GHz, C&Q)
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Test State
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M4A785TD-V
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M4A78T-E
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785GM-E65
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Idle
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N/A
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56W
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N/A
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54W
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N/A
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44W
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Rush Hour
(H.264)
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10%
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~62W
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7%
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~57W
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9%
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~52W
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Coral Reef
(WMV-HD)
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30%
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~73W
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21%
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~64W
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28%
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~68W
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Drag Race
(VC-1)
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40%
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~89W
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35%
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~71W
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40%
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~78W
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Disturbia
(Blu-ray H.264)
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15%
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~71W
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20%
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~70W
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16%
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~57W
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CPU Load
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N/A
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123W
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N/A
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117W
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N/A
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121W
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CPU + GPU
Load
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N/A
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133W
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N/A
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135W
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N/A
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130W
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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)
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Comparison (X3 720 @ 1.6GHz, best undervolt)
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Test State
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M4A785TD-V (1.025V)
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M4A78T-E (0.9125V)
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785GM-E65 (0.940V)
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Idle
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N/A
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59W
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N/A
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50W
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N/A
|
45W
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Rush Hour
(H.264)
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5%
|
~64W
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3%
|
~56W
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4%
|
~52W
|
|
Coral Reef
(WMV-HD)
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37%
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~65W
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22%
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~56W
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35%
|
~55W
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|
Drag Race
(VC-1)
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44%
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~67W
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40%
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~58W
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44%
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~56W
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Disturbia
(Blu-ray H.264)
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9%
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~69W
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23%
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~61W
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9%
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~57W
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CPU Load
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N/A
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74W
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N/A
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63W
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N/A
|
62W
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CPU + GPU
Load
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N/A
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84W
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N/A
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82W
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N/A
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72W
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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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