Menu
Duron 950 to Athlon XP 1.7+ in the test: AMD processor Roundup

Duron 950 to Athlon XP 1.7+ in the test: AMD processor Roundup

Temperature Diode

Another interesting innovation in the new Duron and Athlon XP is a temperature diode that has two pins on the underside of the processor ( THERMDA and THERMDC) can be read from the mainboard. For the first time, owners of an AMD processor have the opportunity to find out the exact temperature of the processor, as has been common practice at Intel since the introduction of the Pentium Pro. However, this function first requires the support of the mainboard. So far, the nVidia nForce-based mainboards are among the first to make successful use of the temperature diode. However, it should only be a questionIt will be time before other mainboards also use this function.

Athlon XP Logic Symbol Diagram
The pins of the temperature diode
The pins of the temperature diode

The temperature diode itself is rather cautiously advertised by AMD at every conceivable place with 'not 100% tested' - certainly not a particularly encouraging statement. According to AMD, the probe is able to detect temperature changes of 40 ° C in at least one second. If the temperature diode is used, the factors for the emergency shutdown of the processor are specified using T-Shutdown and T-SD_Delay. For T-Shutdown, AMD specifies a maximum permissible temperature of 125 ° C, but it should be possible to change this on the corresponding motherboards in the BIOS. A maximum of 500ms is provided for T-Shutdown, i.e. the time until the processor has to be disconnected from the power supply. With the help of these specifications, AMD would like to prevent the processor from heat loss. But it is doubtful that an Athlon XP processor that runs for half a second at a temperature of 125 ° C and is only switched off after this time, i.e. completely within the specifications, can then still be used. Especially since AMD specifies the maximum permissible operating temperature for both the Athlon and the Athlon XP and the Duron processors as 90 ° C. Nevertheless, the temperature diode is a step in the right direction. However, until now it is often useless without the correct support of the hardware. The reaction time of the diode is also quite too short if the fan failsuse, because in this case the processor temperature would not increase by more than 40 ° C per second even under load - the heat sink still swallows enough energy in this case. When the heat sink is completely removed, this is definitely the case under full load. But when does a private user ever take the fan and heat sink from the processor?

Maximum permissible temperature
Processor clock frequency max. Temp. Athlon (Thunderbird) 1333 MHz 95 ° C Athlon (Thunderbird) 1400 MHz 95 ° C Athlon XP 1500+ 1333 MHz 90 ° C Athlon XP 1600+ 1400 MHz 90 ° C Athlon XP 1700+ 1466 MHz 90 ° C Athlon XP 1800+ 1533 MHz 90 ° C Athlon XP 1900 + 1600 MHz 90 ° C Athlon XP 2000+ 1666 MHz 90 ° C Duron (Spitfire) 900 MHz 95 ° C Duron (Spitfire) 950 MHz 95 ° C Duron (Morgan) 1000 MHz 90 ° C Duron (Morgan) 1100 MHz 90 ° C Duron (Morgan) 1200 MHz 90 ° C

Together with the introduction of the Athlon XP, AMD has also slightly decreased the permissible maximum temperatures compared to its predecessor corrected. Because after the previous 95 ° C, a core temperature of 90 ° C is now allowed.

On the next page: Power consumption