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LOSTCIRCUITS
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| Intel's P4 820D and 670 More Power to Duallies | |
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(Review by MS September 3, 2005) |
| P4-670 |
P4 820 vs. 670 By Numbers
The Uneven Twins with the 670 made in Costa Rica and the 820 made in Malaysia
| Model # | Pentium4 670 | Pentium4 820 |
| Manufacturing Plant | Costa Rica | Malaysia |
| Frequency: | 3.8 GHz | 2.8 GHz |
| Cache Sizes: | 16 KB L1 Data + 12 KB L1 Trace Execution Trace Cache/ 2MB L2 Cache | 2 x ( 16 KB L1 Data + 12 KB Execution Trace Cache / 1MB L2 Cache) |
| Memory Controller: | External 2 x 64-bit memory controller (NorthBridge) | |
| Effective Data Bandwidth: | 6.4 GB/sec (limited by host bus) | |
| 64-bit support | EM64T | |
| Package | LGA 775 | |
| Approx. Transistor Count: | 169 million | 230 million |
| Approx. Die Size: | 135 mm2 | 206 mm2 |
| Process Technology | 90 nm copper | |
| Nominal Voltage: | 1.35-1.40V | |
Test Configuration
"955X" Platform:*
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"925XE" Platform:
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"925X" Platform:
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"875" Platform:
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"855" Platform:
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Dual "Socket 940" Platform:
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"Socket 939" Platform:
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"Socket 754" Platform:
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"Socket 940" Platform**:
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2 x WD 36GB Raptor HDD RAID Level0 (Socket 940) | |||
Software 32-bit
For isolated CPU power measurements, we used the following methodology: We used a Fluke 80i-410 AC/DC current probe in combination with a Wavetek Meterman 33XR 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 during 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.
Bear in mind that the power measured is the input power going into the VRM rather than the regulated output power at the individual supply phases. However, the current VRMs are operating in the order of approximately 85-90% efficiency in the worst case. This means that the power measurements are slightly inflated across the board by approximately 10%.
* Since we are interested in a direct comparison of the power numbers of the different high-end P4 cores, we maintained use of the Intel D955XBK mainboard rather than switching to the 945 platform, in order to avoid differences that could stem from different VRM characteristics or other board factors that could contribute to the CPU's power consumption.
** As it turns out, Abbyy is flawed in that it only correcly ID's Intel processors to enable multiple threads whereas AMD CPUs are not correctly identified. We were therefore forced to eliminate Abbyy from the results shown.
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Pentium4 820 D (dual core) |
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