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The AMD Athlon II X2 240e is a 2.8GHz dual-core processor based on the AMD Regor core with a TDP of just 45W. The 'e' behind the Athlon II X2 240e model name indicates that it's one of AMDs Energy Efficient processors.
72% Rating: 
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AMD AMD Athlon II X2 240e |
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Core-by-Core System Power Draw
How much wattage will an energy-efficient
processor save?
AMD's Athlon II X2 240e processor has just a 45W TDP rating, one of the
lowest wattage processors to be placed on PCSTATS' test bench. Maximum TDP
ratings are only half the story though, the processor's idle and single-core
power usage are important factors that will determine its overall value.
To determine how much power multi-core processors draw,
PCSTATS will be measuring total power consumption what the CPU is in idle and
several CPU-stressed states.
To get an accurate measurement, it's necessary to disable
AMD and Intel's power saving and CPU clock speed throttling technologies like
Cool 'n' Quiet, EIST (speedstep) and C1E power states. To simulate single-core load a program called Stress Prime (SP2004) is used.
PCSTATS set about stressing each processor from one
to all cores. This programs gives better insight into different power draw
scenarios. The SP2004 program is multi-threaded, allowing individual CPU cores
to be stressed by each instance of the program.
Total system power consumption was read with the
Extech Power Analyzer Datalogger (model 380803). The Extech Power Analyzer is
located between the main 120AC supply and the PC's power supply.
| Total System Idle
Power Draw |
| Processor |
Total System Power Draw |
| Intel Pentium 4 540 |
   150 Watts |
| Intel Pentium D 840 |
165 Watts |
| Intel Pentium D 940 |
168 Watts |
| Intel Core 2 Duo E6600 |
117 Watts |
| Intel Core 2 Duo E6750 |
123 Watts |
| Intel Core 2 Duo E8400 |
131 Watts |
| Intel Core i7 920 |
144
Watts |
| AMD Sempron 3600+ |
   120 Watts |
| AMD Athlon64 4000+ |
163 Watts |
| AMD Athlon64 FX-60 |
127 Watts |
| AMD Athlon64 X2 4800+ |
143 Watts |
| AMD Athlon64 X2 5000+ |
156 Watts |
| AMD Athlon64 FX-62 |
168 Watts |
 AMD Athlon II X2 240e |
  
122 Watts |
| AMD Athlon II X2 250 |
128
Watts |
| AMD Athlon II X3 435 |
128
Watts |
| AMD Athlon II X4 620 |
130 Watts
|
| AMD Phenom II X3 720 |
155 Watts |
| AMD Phenom II X4 955 |
148 Watts |
| AMD Phenom II X4 965 |
154 Watts
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The idle scores of the Athlon II X2 240e are already looking quite promising,
the only processors that draw less electricity in this state are the Intel Core
2 Duo E6600 and the AMD Sempron 3600+.
| Total System
Stressed Power Draw - All Cores/Threads |
| Processor |
Total System Power Draw (All Cores) |
| Intel Pentium 4 540 |
223 Watts |
| Intel Pentium D 840 (2 Core ) |
240 Watts |
| Intel Pentium D 940 (2 Core Load) |
253 Watts |
| Intel Core 2 Duo E6600 (2 Core Load) |
156 Watts |
| Intel Core 2 Duo E6750 (2 Core Load) |
163 Watts |
| Intel Core 2 Duo E8400 (2 Core Load) |
158 Watts |
| Intel Core i7 920 (8 Thread Load) |
213
Watts |
| AMD Sempron 3600+ |
148 Watts |
| AMD Athlon64 4000+ |
172 Watts |
| AMD Athlon64 FX-60 (2 Core Load) |
196 Watts |
| AMD Athlon64 X2 4800+ (2 Core Load) |
173 Watts |
| AMD Athlon64 X2 5000+ (2 Core Load) |
207 Watts |
| AMD Athlon64 FX-62 (2 Core Load) |
235 Watts |
| AMD Athlon II X2 240e (1 Core Load) |
137 Watts |
| AMD Athlon II X2 240e (2 Core Load) |
153 Watts |
| AMD Athlon II X2 250 (2 Core Load) |
163
Watts |
| AMD Athlon II X3 435 (3 Core Load) |
183 Watts
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| AMD Athlon II X4 620 (4 Core Load) |
195 Watts
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| AMD Phenom II X3 720 (3 Core Load) |
213
Watts |
| AMD Phenom II X4 955 (4 Core Load) |
236 Watts |
| AMD Phenom II X4 965 (4 Core Load) |
264 Watts |
Under load, the results are just as good, the Athlon II
X2 240e's power draw with both cores active is just 153W, which means that only
the AMD Sempron 3600+ draws less power. It really does look like AMD has
engineered a properly power-efficient mainstream processor, which has been a
thorn in AMD's side during its 65nm days. The 45W Athlon II X2 240e doesn't
quite manage a 20W lower power draw when compared to the 65W Athlon II X2
250 processor, but that's more likely because the the latter chip draws less than 65W
to begin with.
With the power question settled, it's time to see just how far a low-wattage processor can be
overclocked, if at all...
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