AMD 780G: Best Ever Integrated Mainstream Chipset?

CPUs|Motherboards
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MORE TEST RESULTS

Comparison: CPU Scaling
Test State
CPU @ 2.5Ghz
CPU @ 1.5Ghz
Mean CPU Use
Peak CPU Use
System Power
Mean CPU Use
Peak CPU Use
System Power
Idle (C&Q)
1%
2%
38W
1%
2%
38W*
H.264
2%
8%
~53W
5%
12%
~42W
WMV3
28%
39%
~65W
38%
52%
~48W
WVC1
47%
68%
~69W
70%
96%
~53W
Blu Ray
23%
31%
~70W
32%
44%
~56W
CPUBurn
100%
101W
100%
58W
CPUBurn + ATITool
100%
109W
100%
65W
1GB of system RAM and 128MB of VRAM were used during testing

* Arrived at by manually underclocking and undervolting. Underclocking disables C&Q by default.

Just how slow of a processor can one use? Gradually underclocking the CPU, we found that the Blu Ray disc began to stutter at about 1.1Ghz, while audio glitches were detected in the WVC1 clip at 1.4Ghz. 1.5Ghz was the lowest clock speed that would smoothly play back all our clips. This was a fantastic result as the lowest clocked X2 on the market is 2.0Ghz. We also undervolted the CPU to 1.0V (the same voltage as Cool-N-Quiet) resulting in Blu Ray playback only requiring 56W from the wall — we wonder how much juice a commercial Blu Ray player uses.

Comparison: Assigned Video Memory
Test State
128MB VRAM
256MB VRAM
Mean CPU Use
Peak CPU Use
System Power
Mean CPU Use
Peak CPU Use
System Power
Idle
1%
2%
38W
1%
2%
38W
H.264
2%
8%
~53W
2%
8%
~53W
WMV3
28%
39%
~65W
28%
41%
~66W
WVC1
47%
68%
~69W
43%
73%
~70W
Blu Ray
23%
31%
~70W
17%
28%
~70W
CPUBurn
100%
101W
100%
101W
CPUBurn + ATITool
100%
109W
100%
109W
1GB of system RAM was used during testing

AMD recommended that we use the 256MB of video memory, 2GB of system memory, and to disable Cool-N-Quiet to get optimal Blu Ray playback. Increasing the amount of video memory garnered some slight improvement during Blu Ray playback, but it wasn't really necessary. Alos, despite Cool-N-Quiet being enabled, even when CPU usage was low as during the H.264 clip, we noticed that the CPU throttled up regardless.

Comparison: System Memory
Test State
1GB RAM
2GB RAM
Mean CPU Use
Peak CPU Use
System Power
Mean CPU Use
Peak CPU Use
System Power
Idle
1%
2%
38W
1%
2%
41W
H.264
2%
8%
~53W
2%
8%
~54W
WMV3
28%
41%
~66W
24%
39%
~68W
WVC1
43%
73%
~70W
43%
61%
~72W
Blu Ray
17%
28%
~70W
17%
21%
~73W
CPUBurn
100%
101W
100%
103W
CPUBurn + ATITool
100%
109W
100%
115W
256MB of VRAM was used during testing

Increasing the amount of system memory also did very little. We saw some minor improvement in Blu Ray and WVC1 playback but at the cost of higher overall power consumption due to the extra stick of DDR2. Even with Vista being an infamous memory hog, using 1GB of RAM with 256MB assigned to the IGP didn't cause us any issues.



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