Would someone explain this to me please?
Why does the P4/Xeon idle so much cooler than the Athlon?
For example, take the two duallies I have here at school. The 2.8GHz Xeons have a TDP of 77w @ stock; the actual maximum is probably closer to 85-90w.
The 2500s have a maximum heat output of 75w or thereabouts iirc. Now, the Xeons are clocked to 3.2GHz (20x160) @ the default voltage. They have the stock heatsinks with AS5, and the stock fans, which are thermally controlled by the motherboard. They're currently running at about 50% of maximum RPMs. The CPUs are at 82 and 89*F, respectively.
Compare that to the Athlons, which are at a basically stock 1.86GHz (133x14), with Aerocool DP-101 heatsinks and 18cfm 60mm fans. The Athlons are idling at 105*F and 120*F, respectively (although the second CPU may be reading a little high; the K7D seems to read the second cpu 10*F too high or so). So the Athlons have better heatsinks, put out less heat, have better case cooling (by virtue of the fact that the PSU fan in the dual Athlon system is set to run at full speed), a cooler running video card (so case temps should be lower), yet they idle at a higher temperature. Why is that?
For example, take the two duallies I have here at school. The 2.8GHz Xeons have a TDP of 77w @ stock; the actual maximum is probably closer to 85-90w.
The 2500s have a maximum heat output of 75w or thereabouts iirc. Now, the Xeons are clocked to 3.2GHz (20x160) @ the default voltage. They have the stock heatsinks with AS5, and the stock fans, which are thermally controlled by the motherboard. They're currently running at about 50% of maximum RPMs. The CPUs are at 82 and 89*F, respectively.
Compare that to the Athlons, which are at a basically stock 1.86GHz (133x14), with Aerocool DP-101 heatsinks and 18cfm 60mm fans. The Athlons are idling at 105*F and 120*F, respectively (although the second CPU may be reading a little high; the K7D seems to read the second cpu 10*F too high or so). So the Athlons have better heatsinks, put out less heat, have better case cooling (by virtue of the fact that the PSU fan in the dual Athlon system is set to run at full speed), a cooler running video card (so case temps should be lower), yet they idle at a higher temperature. Why is that?
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What temps do you get at full load?
Is is possible that the XPs are not going to idle?