I ruled out the obvious root causes (overheating, faulty PSU, faulty RAM modules, outdated BIOS) and started to focusing on Turbo Boost.Īccording to the specification of this processor, base frequency is 2.00GHz which can go up-to 3.00GHz (for a single core) with Turbo Boost. What is the maximum core frequency for this CPU when all cores are utilized? Is it possible that I need to manually limit the maximum frequency to stabilize my system? Could it be a BIOS or OS issue, or I just have a faulty CPU? I observed, that when lock up happens, all 4 cores are running on ~2.6GHz which seems to be a bit high. My mainboard is an ASRock Z97M-itx/ac with the latest BIOS and I even ensured that the most recent microcode update is loaded by the OS (Debian Linux with kernel 4.9.13).Ĭould it be a similar issue with 4th Gen i5 as well? I heard that 6th generation of Core CPUs suffered from a bug which caused freeze during high load (Prime95) when using AVX instructions. I would appreciate any comments and ideas. In regards to your question "What is the maximum core frequency for this CPU when all cores are utilized?" Thank you for contacting Intel Communities. DPAT limits the settings for the processor to keep latency low all the time.You can click here to check the maximum frequencies while the Intel® Turbo Boost Technology is enabled, please expand 4th Generation Intel® Core™ i5 Desktop Processors and look for the processor you have. Dell Processor Acceleration Technology (DPAT), enabled through the BIOS Dell Controlled Turbo, may provide a better performing solution than turning turbo off. Some environments such as High Frequency Trading in the Financial Markets need low latency in their transactions. There is some latency in stepping frequency, changing C states and other CPU functions. Turbo Boost is limited by the number of cores, current and estimated power consumption and temperature. When the OS instructs an Active core to enter C3 sleep state the other cores dynamically accelerate to a higher frequency. Turbo Boost is activated by the Operating System (OS) following ACPI standards using processor performance states. Intel Turbo Boost 2.0 provides the highest frequency of available cores in a multicore multiprocessor environment within the power constraints of the CPU. Dell Processor Acceleration Technology Summaryĭell servers set to Maximum Performance in the bios is intended for maximum throughput, not latency.
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