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Intel Core 2 Duo E8400 3.0GHz 1333MHz FSB Processor Review

Intel Core 2 Duo E8400 3.0GHz 1333MHz FSB Processor Review - PCSTATS
Abstract: Intel's Core 2 Duo E8400 is a 3.0GHz dual-core processor based on the 'Wolfdale' core that is being manufactured on the 45nm process. This socket 775 processor packs in 6MB of L2 cache and operates with a 1333MHz Front Side Bus speed.
 83% Rating:   
Filed under: CPU / Processors Published:  Author: 
External Mfg. Website: Intel May 08 2009   Julian Apong  
Home > Reviews > CPU / Processors > Intel Core 2 Duo E8400

CPU Power Consumption Tests

Gone are the days when performance benchmarks settled all Intel vs. AMD processor debates. Energy efficiency is in, and if electrical bills don't motivate you then reduced heat output and quieter cooling system will certainly make your head turn

Wading through the technical numbers to figure out the differences can be confusing because Intel and AMD report power values in slightly different ways. On paper AMD lists its processors maximum power TDP value, while Intel posts typical Thermal Design Power figures.

Obviously the two measurements of processor power consumption are not quite directly comparable, so to find out how processors stack up in the power efficiency department we need to measure how much power the computer draws while idle, then while in a CPU-stressed state.

To get a more accurate indication of what speeds the processors are currently running at, PCSTATS first disabled a bunch of 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) for both CPU loaded and CPU idle states. These values are measuring an entire system while the processor is running under computational load or idle.

The Extech Power Analyzer is located between the main 120AC supply and the PC's power supply. Given that motherboards vary across these test systems this is not a "true" measure of CPU power draw alone, but rather a measurement of the total computer system power draw, which we can compare for each specific platforms between the CPU idle and CPU stressed states.

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 Phenom II X3 720 155 Watts
AMD Phenom II X4 955 148 Watts

At idle the Intel Core 2 Duo E8400 system isn't able to take a whole lot of advantage of its smaller 45nm manufacturing node, which means it draws a few Watts more than the Intel Core 2 Duo E6600 and E6750. The larger AMD processors have difficulty keeping up with the Core 2 Duo processors, as they're still manufactured on larger 90nm or 65nm processes.

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 (1 Core Load) 152 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 Phenom II X3 720 (3 Core Load) 213 Watts
AMD Phenom II X4 955 (4 Core Load) 236 Watts

With one processing core running at full load the system consumes 152W of power. The only test system that uses less is the one equipped with an Intel Core 2 Duo E6600 and the 65W AMD Sempron 3600+ processor. In comparison, an ancient Pentium D 940 CPU system pulls a mind-blowing 230W of power while the Athlon64 FX-62 is no saint either at 196W!

Here the wattage starts to ramp up, and now even though the Core 2 Duo E8400 is clocked at faster speeds and gives better performance, it still managed to draw only 158W under load, less power than the Core 2 Duo E6750 when both cores are stressed. Really, the only processors that are drawing less power are the Core 2 Duo E6600 and AMD's entry-level Sempron 3600! Intel's renewed focus on energy-efficiency is really paying off here.

Now to the fun stuff, 1333MHz FSB processor overclocking!

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Contents of Article: Intel Core 2 Duo E8400
 Pg 1.  Intel Core 2 Duo E8400 3.0GHz 1333MHz FSB Processor Review
 Pg 2.  — CPU Power Consumption Tests
 Pg 3.  Overclocking the Core 2 Duo E8400 / Test System Specs
 Pg 4.  32-bit CPU System Benchmarks: SYSMark 2007, PCMark Vantage
 Pg 5.  32-Bit CPU Synthetic Benchmarks: Office Productivity, SiSoft Sandra
 Pg 6.  32-Bit CPU Calculation Benchmarks: Super Pi, wPrime2.0, ScienceMark2, WinRAR
 Pg 7.  32-Bit CPU Rendering Benchmarks: Cinebench R10, Bibble 5
 Pg 8.  32-Bit CPU Rendering Benchmarks: POV-Ray, 3.7, SPECviewPerf 10
 Pg 9.  32-Bit CPU Synthetic Gaming Benchmarks: 3DMark Vantage, 3DMark 06
 Pg 10.  32-Bit CPU Gaming Benchmarks: Crysis, FEAR
 Pg 11.  Core 2 Duo E8400 Workhorse CPU

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