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LOSTCIRCUITS	SHORTCUTS: Winning by Evolution Test Configurations/ Benchmarks CPU Specs Power Consumption Memory Subsystem TrueSpace POVRay 3.7 beta .21, Cinebench Media Encoding 3Dmark '06 FarCry F.E.A.R Final Thoughts Give Us Some Feedback on this Review
Intel's Core 2 Quad Extreme Edition QX6850 and Core2 E6750 Host bus: 1333 MHz
(Review by MS, July 15, 2007)

Test Configuration

* All benchmarks for the BE 2350 were run on the Foxconn Foxconn C51XEM2AA motherboard. For the "BE 2300" benchmarks we were running the same CPU with C'nQ disabled and the mutiplier set to 10x

** 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+

*** The ASUS P5K3 features two 16 x PCI slots (physical configuration) but the secondary slot only runs in 4 x configuration. In theory, a 4 x configuration has enough bandwidth for most gaming application but pairing 16 x slot with a 4 x slot for a "hacked SLI" configuration resulted in extremely poor performance with pronounced artifacts in the display. Similar issues were found with Crossfire cards.

Benchmark Overview

• SiSoft Sandra 2007.5.11.35
• Caligari TrueSpace 5.1
• Cinebench 9.5
• POV Ray 3.7 Beta .21****
• MainConcept H.264
• DVD-Shrink 3.2
• DR. DivX OSS 2.0
• 3DMark'06
• DOOM3
• FarCry (patch 1.4)
• F.E.A.R.
• Prey

**** POVRay betas expire at specific dates, which can be tricked by resetting the system clock in the CMOS setup. However, especially in the case of Vista, this results in invalidation of the license. On the other hand, we observed some significant differences in performance between the different betas, therefore, the results are not necessarily showing apples to apples.

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. However, it is necessary to keep in mind that different VRMs will run at different efficiencies. Especially under low load conditions, this can skew the idle power consumption figures since some VRMs will dop down to about 50% of efficiency.

(BX80557E6300)

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