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LOSTCIRCUITS	SHORTCUTS: A Process Shift Brisbane by Numbers Test Configurations Memory Subsystem Power Consumption 3D Rendering and Power per Renderpass POV-Ray- Cinebench AV-Encoding 3Dmark'06 F.E.A.R. DOOM3 FarCry L2 Cache Latencies The Plot Thickens Final Thoughts Give Us Some Feedback on this Review
AMD's Brisbane Core - the Transition to 65 nm And the cache latency
(Author: MS, January 5, 2007)

Test Configuration

** AMD uses the same model numbers for different revisions. To allow a better distinction between the processors shown, we use the * to flag the 65 nm G-stepping. In addition, we are labeling the 65 nm CPU running at 2.4 GHz with a memory frequency of 800 MHz as 4600* for a direct apples to apples comparison to the 4600+

Benchmark Overview

We used the followig benchmarks:

• SiSoft Sandra 2007
• Cachemem 2.65
• ScienceMark 2.0
• CPU-Z
• Caligari TrueSpace 5.1
• POVRay
• Cinebench 2003
• 3DMark2006
• Call of Duty2
• DOOM3
• FarCry
• F.E.A.R.
• MainConcept H.264
• Dr. DivX OSS
• DVD-Shrink 3.2

Power Measurements

Looking at system power consumption is interesting to a certain degree, however, for all practical purposes we are more interested in the isolated CPU power consumption. To estimate the latter, we used the same power measurement setup as in previous reports. Briefly, we used a Fluke 80i-410 AC/DC current probe in combination with a Wavetek Meterman 30XR multimeter to measure current through the isolated +12V supply lines feeding into the CPU VRM. To increase granularity of the measurements, we ran the supply lines in a triple loop through the clamp. The clamp itself was calibrated using a BK Precision model 1692, 30V 40 A DC power supply. Since there is a temperature dependency of the probe, we monitored the zero-current offset at the beginning of each measurement as well as at the end of each run. If the values drifted we retook the measurements. Despite these precautions there are possible deviations of the read-out from the real current, however, these errors mostly affect the lower (processor idle) measurements. We estimate that the errors should not be more than 10% at the lower end of the data and less than 5% in the mid and higher data range. Moreover, since the same procedures were applied to all processors tested, there may be an offset in the absolute numbers, however, the relation of the individual cores to each other with respect to power consumption should be fairly accurate.

In addition to the method outlined above, we used a modified PSU to run the 12V line directly through the Wavetek Meterman and read out the current. Both methods gave identical results.

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