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TEST RESULTS
A. AT FULL LOAD
Prevailing conditions during testing were 20~21°C and 117~119VAC, measured with
the Extech power meter.
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Power Consumption at Full CPU Load
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Processor
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Platform
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Clock Speed
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Vcore
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CPU Power* (DC)
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System Power† (AC)
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Stock
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Min
|
Stock
|
Min
|
Stock
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Min
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Intel P-M 770
Dothan
|
479-1
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2.13 GHz
|
1.30V
|
1.12V
|
23.3W
|
13.8W
|
65W
|
53W
|
|
AMD Turion 64 ML-40
Lancaster
|
754
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2.2 GHz
|
1.22V
|
1.05V
|
26.4W
|
18.1W
|
64W
|
54W
|
|
Intel Core Duo T2600‡
Yonah
|
479-2
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2.16 GHz
|
1.26V
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1.15V
|
25.4W
|
19.5W
|
78W‡
|
75W‡
|
|
AMD A64 3000+
Venice
|
939
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1.8 GHz
|
1.39V
|
1.18V
|
31.9W
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20.5W
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74W
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61W
|
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AMD Sempron 3400+
Venice
|
754
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2.0 GHz
|
1.39V
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1.19V
|
38.9W
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26.4W
|
82W
|
66W
|
|
AMD A64 3500+
Winchester
|
939
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2.2 GHz
|
1.41V
|
1.24V
|
47.5W
|
31.6W
|
98W
|
80W
|
|
AMD A64 4000+
San Diego
|
939
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2.4 GHz
|
1.39V
|
1.29V
|
42.8W
|
34.3W
|
88W
|
76W
|
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AMD A64 3500+
Venice
|
939
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2.2 GHz
|
1.41V
|
1.22V
|
53.8W
|
34.6W
|
104W
|
83W
|
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AMD A64 X2 3800+
Toledo
|
939
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2.0 GHz
|
1.39V
|
1.22V
|
58.0W
|
41.4W
|
109W
|
90W
|
|
AMD A64 X2 4800+
Toledo
|
939
|
2.4 GHz
|
1.37V
|
1.22V
|
87.3W
|
61.9W
|
144W
|
115W
|
|
Intel P4 630
Prescott
|
775-1
|
3.0 GHz
|
1.23V
|
1.23V
|
77.7W
|
77.7W
|
128W
|
128W
|
|
Intel P-D 820
Smithfield
|
775-1
|
2.8 GHz
|
1.31V
|
1.14V
|
124.0W
|
90.5W
|
181W
|
142W
|
|
Intel PD 930 Presler
|
775-2
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3.0 GHz
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1.22V
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1.21V
|
93.6W
|
93.6W
|
146W
|
146W
|
|
Intel PD 950
Presler
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775-2
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3.4 GHz
|
1.22V
|
1.22V
|
105.1W
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105.1W
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160W
|
160W
|
|
Intel P4 670
Prescott
|
775-1
|
3.8 GHz
|
1.34V
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1.34V
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128.9W
|
127.7W
|
197W
|
195W
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Notes for above table:
*CPU power includes losses in the motherboard voltage regulators. The power drawn by the CPU alone is probably ~20% lower.
† The system power includes losses in PSU AC/DC conversion.
At >100W AC, it is probably not much more than 20%. At <70W AC, the loss could be >30%.
‡
System power on the Yonah platform is higher because it required an outboard PCIe graphics card.
With an onboard graphics motherboard, it would be 10~15W lower. |
The table above is ranked by CPU Power, with the lowest at the top. The top two-thirds of the table (<60W) contains only AMD processors and two mobile Intel processors. There is only one AMD processor, the X2-4800+, arguably the most high performance CPU in the entire group, that reaches 60W. Five Intel processors make the bottom ranks; the 670, a single core P4-3.8, requires more than double the power of the dual core X2 4800+.
This is not the result of us choosing processors to bias the test. The Intel 630, just about the slowest desktop P4 Intel offers at this time, draws more power than the AMD A64 X2 4800+, the second most powerful desktop processor AMD offers currently. To top it off, the 630 is a single core processor while the X2 4800+ is a dual core.
It is true that Celerons are missing while there is a Sempron in the mix. However, this would have made little difference. All the current 2.4~2.8 GHz Celerons have 60~68W TDP, while our Sempron 3400+ sample measured 31.9W including VRM losses. Also, retailers FrontierPC and NCIX in the Vancouver area reported that there was no demand for Celerons — and hardly any supply at this time.
B. AT IDLE
Power consumption at idle is similarly one-sided. At the top with 1~2.2W power consumption are the mobile processors. At the bottom are the Intel desktops at 21.6~33.6W. AMD desktop processor systems ranged from a low of 4.1W to a high of 9.8W, which is pretty narrow, given the performance range represented — Sempron 3400+ to X2 4800+.
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Power Consumption at Idle
|
|
Processor
|
Platform
|
Clock Speed
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CNQ / EIST
|
Vcore
|
CPU Power*
|
System Power†
|
|
Intel P-M 770
Dothan
|
479-1
|
800 MHz
|
yes
|
0.734V
|
1.0W
|
40W
|
|
Intel Core Duo T2600‡
Yonah
|
479-2
|
1.0 GHz
|
yes
|
0.95V
|
1.5W
|
53W‡
|
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AMD T64 ML-40
Lancaster
|
754
|
800 MHz
|
yes
|
0.92V
|
2.2W
|
40W
|
|
AMD Sempron 3400+
Venice
|
754
|
1.0 GHz
|
yes
|
1.10V
|
4.1W
|
44W
|
|
AMD A64 3000+
Venice
|
939
|
1.0 GHz
|
yes
|
1.18V
|
4.8W
|
48W
|
|
AMD A64 X2 3800+
Toledo
|
939
|
1.0 GHz
|
yes
|
1.18V
|
5.6W
|
51W
|
|
AMD A64 4000+
San Diego
|
939
|
1.0 GHz
|
yes
|
1.18V
|
5.6W
|
51W
|
|
AMD A64 3500+
Winchester
|
939
|
1.0 GHz
|
yes
|
1.19V
|
8.1W
|
53W
|
|
AMD A64 X2 4800+
Toledo
|
939
|
1.0 GHz
|
yes
|
1.18V
|
8.8W
|
53W
|
|
AMD A64 3500+
Venice
|
939
|
1.0 GHz
|
yes
|
1.18V
|
9.8W
|
55W
|
|
Intel P4 630
Prescott
|
775
|
2.8 GHz
|
yes
|
1.23V
|
20.7W
|
64W
|
|
Intel PD 820
Smithfield
|
775
|
2.8 GHz
|
yes
|
1.17V
|
26.7W
|
71W
|
|
Intel PD 950
Presler**
|
775
|
2.4~3.4 GHz
|
yes
|
1.19V
|
6.4 / 31W
|
74W
|
|
Intel PD 930
Presler**
|
775
|
2.4~3.0 GHz
|
yes
|
1.22V
|
7.8 / 32W
|
75W
|
|
Intel P4 670
Prescott
|
775
|
3.8 GHz
|
yes
|
1.24V
|
33.6W
|
84W
|
|
Notes for above table:
*2x12V power includes losses in the motherboard voltage regulators. The power drawn by the CPU alone is probably ~20% lower.
† † The system power includes losses in PSU AC/DC conversion. At >100W AC, it is probably not much more than 20%. At <70W AC, the loss could be >30%.
‡
System power on the Yonah platform is higher because it required an outboard PCIe graphics card.
With an onboard graphics motherboard, it would probably be just over 40W.
** The Intel Pentium D 930 and 950 idle power measurements require some explanation. When our standard high precision LTS 25-NP Current Sensor was used to read the AUX12V current, very low <10W values were obtained. Using our old Fluke 36 Clamp Meter on the 12V leads gave us the second set of 31~32W readings, which are much more believable. It's an odd testing anomaly isolated only to these processors.
Idle CPU Voltage for the socket 939 processors could not be set below 1.18V on the ASUS A8N-VM CSM
motherboard used for thiis platform, neither in the BIOS nor with any software utilities like Crystal CPU ID. Chances are very good that the idle Vcore could be considerably lower, and this would mean lower system power as well. Some SPCR forum members have reported fine operation with <1.0V idle C'n'Q Vcore on A64 processors.
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