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Source: Tom's Hardware – Keywords: amd, power, cpu
Topics: AMD/ATI
Syndication:
AMD Phenom: Up to 27 Watts During Standby
Before we get to the comparison tests of all the AMD processors, we would like to talk about a problem with the Phenom processor. During our testing, we found out that, in comparison to all other AMD CPUs, the Phenom has a very high power draw during standby. Even when Cool’n’Quiet mode is activated, depending on which motherboard is used, the energy intake is almost three times higher.
The Phenom 9600 processor switches down to a clock rate of 1150 MHz during standby mode. Its multiplier then becomes 5.8x and the core voltage goes down to 1.050 V.
In order to find out where the processor’s high power intake comes from, we measured our Phenom 9600 Black Edition on AMD 790FX boards from Asus, Gigabyte and MSI.
In our opinion, the electrical intakes of all three motherboards are too high to be acceptable. We measured 27.69 W on the Gigabyte board, while the MSI board achieved 20.27 W, which at its best is twice as much as the Athlon 64 X2 6400+.
Surprisingly, there is a difference of up to 7.4 W between the MSI and Gigabyte motherboards. While the MSI motherboard has a 5-phase regulator and the Gigabyte board is equipped with a 10-phase regulator, it’s unlikely that the Gigabyte’s additional 5-phase regulator uses more than 7.4 watts. There is the possibility that the Phenom doesn’t switch down to a lower voltage properly, which cannot be detected with classic diagnostic tools like CPU-Z, Core-Temp or Everest.
The Phenom 9600 needs up to 20.27 watts during standby, even with Cool’n’Quiet mode turned on. With the Gigabyte board it even goes up to 27.69 W. When compared to the Athlon 64 X2 6400+, the electrical intake is simply too high.
- Previous page Measuring Devices and Testing Methods
- Next page Testing 35 AMD Processors
The are still built on the 90nm process.
The P45 will introduce the 65nm process on the chipsets.
The latest AMD Chipsets use the 55nm process.
In regards to CPUs, The Intel CPUs generally use less than the AMD CPUs.
He was simply pointing out that the CPUs lose some of the benefeit of their low power consumption due to the chipset.
For lower-end chips sitting idle, the difference in power usage of the chipsets can be significant. If you are looking at a higher-end chip under load, the power usage of the chipset becomes nominal.
Intel is not the greenest if it is less power hungry? Do they not meet RoHS standard or something?
Rohs = reduction of hazrdous substances, nothing to do with power consumption
at least one could see, if intel's "nominal" TDP's are as regular as amd's.
here we see, the phenom 95 watts DO HAVE 95 watts at maximum.
IMO the dynamic power used by the processor is a factor of frequency, voltage and probably the number of transistors. The Phenom has 2 more cores, and a much larger L3 cache. The Phenom core itself is fairly similar to the K8s, and should not exhibit that much power increase if you can match the setup of a typical X2...
I would be interested to see a chart that showed how many watts it takes to do a multi threaded task. For example, a faster core(s) finishes the job quicker then can drop to its low power state. And also on how much work can be done in a distributed computing task. This would be similar to "it takes X-watts to complete a task.”
Its grate and more economyc than cool n´quite.
HTPCs is probably hit the hardest by this, and any other system that is placed in so called computer desks that have a closed cabinet for the PC. Hot running system increases heat generation and affects home/server room temperatures which also affects the power bill. Cooler running systems also lead to quieter system cause of the decrease of cooling fans.
One Item I would also like to see tested are power consumption among motherboards. CPUs and GPUs are obvious that the higher the performance the more the power will be used, but how does it compare with motherboards.
Nice article! I would be interested to see a chart that showed how many watts it takes to do a multi threaded task. For example, a faster core(s) finishes the job quicker then can drop to its low power state. And also on how much work can be done in a distributed computing task. This would be similar to "it takes X-watts to complete a task.?
YES! Specifically, I'd like to see how much energy is used by each system if they have to do the same task for a given about of time ... like play a dvd for 2 hours.
-m