![]() ![]() I read the following, when the computer is not running much: So I used smfancontrol and set it to 1214 rpm like you have. My ambient temperature is nearly the same at 22 C. I was wondering what temperatures other people are reading who have the same type of Mac. Regardless of what anyone says, running these used CPUs at a constant minimum of 87/100 peak temperature will degrade the CPUs. You sound like someone who keeps their computer for awhile. I tried to keep the Northbridge heatsink below 180 F. Without SMC the Mac Pro's fans never reacted to hot temps and I found that putting the fans at 800-1100 minimum, faster on warm days, was better than replacing fried video cards. At 90 F and above I would have to max the CPU fans to bring the temp down after doing anything that was CPU intensive. I was never able to run the Duos without upping the fans considerably when the ambient went above 76 F. The ambient temperature is 6-30 F less than normal average for this area. Temperature Control says max allowed core temp is 100 C. Memory modules are all hotter than CPUs.Īll temps via Temperature Monitor, which is no longer supported, but works on 10.7.5. I use SMC fan control and the CPU fan is at 1214rpm. My temps for Cores 1-4 are 33-37 C, cores 5-6 are 30-33 C. But we have cool ambient temperatures now and I didn't write numbers down for hard comparisons. The quad cores are running significantly cooler than the Duos were. Unfortunately Intel does not make CPU testing tools for OS X to see if the CPU is reducing its speed when reaching that temperature. My best guess is that the CPU does not displace the heat form the silicon die to the IHS properly. Even when running a stress test for 30 minutes, the temperature of the heat-sink and CPU core maintains the same 30º C - 35º C difference. The CPU/Memory intake fans pretty much stay at 500 - 600 rpm when this happens. I guess that would make sense, however, assuming that the heat-sink is always going to be somewhat cooler than the CPU, 58º C would already be too high. Since the sensor for the heat-sink sits right above the copper plate that touches the CPU, it may come close to measuring the TCASE temperature. But what exactly is measured here?Īccording to the specs, the maximum operating TCASE is 63º C. From what I understand, 100º C for any CPU die is generally critical, so 91º C could be OK. That is what the heatsink is supposed to be doing, is carrying away the heat toward the fins, which would measure even cooler. The temperature measured on the heat-generating silicon will always be higher than the temperature measured on the heatsink. Your temperatures look a little high, but not outrageous. Would anyone know if the IHS on the CPU is soldered or whether they used thermal compound between the IHS and the CPU die? In case of the later, perhaps it could explain current temperature readings. For this reason, the measured TCASE value of a given processor can decrease over time depending on the type of TIM material. grease breakdown) during the useful life of the processor due to the temperature cycling phenomena. The TIM performance is susceptible to degradation (i.e. The heat-sink provided by Apple also features a temperature sensor, that appears to be attached right on the coper plate that touches the CPU head spreader.Ĭonsidering the following quote from the same document: operating temperature according to -1333-MHz-FSB is 63 degree Celsius.Īccording to -hub-guidelines.pdf the Quad-Core Intel® Xeon® Processor 5300 Series include an on-die temperature sensor feature. There should be pretty good contact between the heat-sink and the CPU when installed, because they stick together quite well when attempting to remove the heat-sink again. Nothing so far had any affect on the temperature readings. I'm using new Arctic MX-2 thermal grease and tried various measures, including polishing the surface of the CPU and heat-sink using 1000 grit sandpaper. Is it possible, that the CPU's have exceed their life expectancy?ĭuring a stress test, I can see the following typical readings: Assuming that the readings are correct, I have no explanation for the typical 30 degree Celsius difference between the CPU and the heat-sink. However, I worry about the CPU temperature readings. The system has been running fine for months. I have a Mac Pro 1,1 upgraded with two Intel Xeon X5365 CPU's and firmware 2.1. ![]()
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