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LOSTCIRCUITS	SHORTCUTS: Odd and Un-even numbers X3 cores Test Configurations Memory Subsystem Power Consumption TrueSpace and Power Efficiency Cinebench MainConcept DVD-Shrink, Nero Recode VirtualDub/DivX 3DMark'06 World In Conflict Crysis F.E.A.R. UnrealTournament3 The Final Analysis Give Us Some Feedback on this Review
AMD's Phenom X3 8750 - The Power of 3
(Author: Michael Schuette, April 27, 2008)

Test Configuration

* On average, the X3 8750 performed noticeably better on the ASUS board than on the Gigabyte board, for example in World-In-Conflict, the ASUS board ran at 48 fps (avg) whereas the Gigabyte board came in at 43 fps (avg). Similar diifferences were in Crysis (83 fps vs. 75fps) and some other gaming benchmarks. However, in F.E.A.R., the ASUS board generated erratic results in the order of 80-100 fps whereas theGigabyte board scored consistently in the 200 fps range. Given the novelty of the platform and the fact that we are interested in the CPU performance rather than flogging some quirks of some motherboard, we give the X3-8750 the benefit of the doubt and show the best score (average of each board).

** 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 the relevant graphs. 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+

+ Four 667 MHz DDR2 FBDIMMs gave better performance than two DDR800 FBDIMM modules, therefore, all benchmarks shown were run in the four-FBDIMM configuration with both branches and channels filled up.

++ Since it turned out that the "green" AOD setting was the least stable OverDrive mode with frequent crashes, whereas there were no problems in "red" mode, all benchmarks were run in "red" mode.

)* For a direct comparison we ran all available LGA 775 processors on the ASUS P5K3 in selected benchmarks such as Cinebench10 and VirtualDub/DivX, World In Conflict, Unreal Tournment3, Crysis

)** The QX9770 was run at 8 x 400 MHz with DDR3 1600 at 8-8-8 latency settings

Benchmark Overview

• SiSoft Sandra XII SP2 2008.1.14.24
• Caligari TrueSpace 5.1 (we are still in the process of gathering data on TrueSpace 7.5 which is not backwards compatible with our benchmark files)
• Cinebench 9.5
• Cinebench 10
• MainConcept H.264
• DVD-Shrink 3.2
• Nero 8.1 Recode
• VirtualDub 1.76 with DivX 6.7
• F.E.A.R. Built-in benchmark
• Unreal Tournament3 "Demo"
• Crysis "Demo"
• World in Conflict "Demo"
• Futuremark 3DMark'06
• Timeshift and Bioshock were tested for playablity only without quantification of benchmark results

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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