Regardless of the method used, CPU temperature in BIOS is higher than in Windows at idle, because BIOS boots the processor without power saving features to ensure that it will initialize under any conditions.Īpplies to: Previous Generation Core i and newer processors (Socket 115x and Socket 2011). For these processors, CPU temperature is the hottest Core, or Package temperature. The monitoring utilities provided by motherboard manufacturers on the Driver DVD displays “CPU” temperature in Windows. Method 2: Previous Generation Core i and newer processors (Socket 115x and Socket 2011) no longer use an Analog Thermal Diode, but instead use the hottest Core as CPU temperature which is displayed in BIOS, and is defined as “Package” temperature (see Section 4). For these processors, BIOS or CPU temperature may not be accurate. Accuracy can vary greatly with BIOS updates. The Analog value is converted to Digital (A to D) by the motherboard's Super I/O (Input / Output) chip, then is calibrated to look-up tables coded into BIOS. Method 1: Legacy Core 2 (Socket 775) and Previous Generation Core i (Socket 1366) use a single Analog Thermal Diode centered under the Cores to substitute for a laboratory thermocouple. One of two different methods are used to display “CPU” temperature in BIOS and in monitoring utilities. The stock cooler is then installed and the processor is tested at a steady 100% workload. For testing only, a groove is cut into the surface of the IHS where a "thermocouple" is embedded at the center, which accurately measures the temperature for the entire CPU. It's measured on the surface of the Integrated Heat Spreader (IHS) under tightly controlled laboratory conditions. With conventional air or liquid cooling, no temperatures can be less than or equal to Ambient.Īs Ambient temperature increases, thermal headroom and overclocking potential decreases.Īlso called "Tcase", this is the temperature shown in Intel's Thermal Specification. When you power up your rig from a cold start, all components are at Ambient, so temperatures can only go up. or a change of 1C = a change of 1.8FĢ2.0C = 71.6F Norm. Here's the temperature conversions and a short scale:Ĭx9/5+32=F. Use a trusted analog, digital or IR thermometer to measure Ambient temperature. Knowing your Ambient temperature is important because Ambient directly affects all computer temperatures. Ambient temperature is a reference value for Intel’s Thermal Specifications. Standard Ambient temperature is 22C, which is normal room temperature. Use CPU-Z to identify your processor, then look up the specifications at Intel Product Information:Īlso called "room" temperature, this is the temperature measured at your computer's air intake. Here’s a list of processors referenced according to microarchitecture: In order to get a clear perspective of processor temperatures, it's important to understand the terminology and specifications. The relationship between Core temperature and CPU temperature is not in the Thermal Specifications it's only found in a few engineering documents. Tcase + 5 makes the corresponding Core temperature 77C. For example, Tcase for the i5 4690K is 72C. Core temperature is 5C higher than CPU temperature due to differences in sensor proximity to the heat sources. Intel's Thermal Specification is "Tcase", which is CPU temperature, not Core temperature. Depending on processor architecture, one of two different methods are used to measure CPU temperature. Heat originates at the transistor junctions within each Core where sensors measure Core temperatures. Intel desktop processors have a temperature for each Core, plus a temperature for the entire CPU, so a Quad Core has five temperatures. This Guide supports Core i and Core 2 desktop processors running Windows Operating Systems. The purpose of this Guide is to provide an understanding of standards, specifications, thermal relationships and test methods so that temperatures can be uniformly tested and compared. Whether you overclock or not, the topic of processor temperatures can be very confusing. Thanks to Tom's Guide for this excellent article
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