|
Advice Beginners BIOS Guide CPUs Links Mainboards Memory Network Storage Video/Sound Cards Contact Forum SiteMap Sponsors WebNews Home |
. | . |
Prices: Mainboards ABIT ASUS Chaintech Shuttle Soyo Tyan CPU Intel P4 2.4C-800 P4 2.6C-800 P4 2.8C-800 P4 3.0-800 P4 3.2-800 AMD AthlonXP XP 1700+ XP 2000+ XP 2400+ XP 2500+ XP 2700+ XP 3000+ XP 3200+ Athlon64 Athlon64 3200+ Athlon64 FX-51 Opteron Opteron 240 Opteron 242 Opteron 244 Opteron 246 Memory Corsair Crucial Kingston Mushkin OCZ |
|
|
|
LOSTCIRCUITS
|
|
| AMD's Brisbane Core - the Transition to 65 nm And the cache latency | |
|
(Author: MS, January 5, 2007) |
Power Consumption
We measured power consumption in Windows at Idle with C'nQ enabled in the BIOS and with the appropriate CPU drivers installed. One issue we ran into with the ASUS M2R32 MVP was that the board autoimatically overvolts the CPU. According to AMD's specs, we therefore manually set the CPU voltage to a lower value - with the result that the board still generated a core voltage approximately 0.07 V above the defined value. In order to run something "reasonable", we set the voltage to 1.200 V in the CMOS Setup which then gave us a core voltage of 1.27 V, which is within the specified range for the 65 nm core. The system was running rock solid under these conditions. For good housekeeping, though, it is necessary to disclose this variation.
At the "Auto" setting, the ASUS M2R32 overvolts the processor to 1.424 V (sometimes even higher) which substantially skews the power consumption compared to the rated settings (1.25-1.35V).
Windows Idle Power Consumption
Most computers spend a lot of time idle and the idle power of any processor, as small or large it may be is an important factor in the overall power consumption of the system over time.
Power consumption [W]: lower is better
Full Load Power Consumption
All Brisbane cores are rated at a TDP of 65W compared to the 90nm Windsor cores (F-stepping). Keep in mind that the TDP is the requirement that platform suppliers have to meet in order to warrant flawless operation of the CPU rather than a real measurement of power consumption. Arguably, the two are related but on the other hand, most CPUs - at least in the case of AMD - are running way below TDP even under maximum load that can be achieved in any desktop situation.
As always, we are running as many instances of Prime95 as any given processor supports. In the case of a single core, that is one instance of Prime95, with HyperThreading or dual cores, it is 2 instances and with HT and dual cores or else with any quad core / SMP using dual core CPUs, it is four instances running simultaneously.
Power consumption [W]: lower is better
In both idle and full power scenarios, the Brisbane-based 4800+ running at 2.5 GHz sets essentially new standards. If the core frequency was factored in, the Brisbane would beat out even the 3800+ ADD (ultra low power) in idle and under full load it would also be among the top contenders
next page: => 3D Rendering and Render Power =>
All advice and educational articles on LostCircuits are free, but if you feel you can, please make a small donation to us!
