I5 8600k OC model at 4.8GHZ, 1.38V operation, peak performance up to 88 degrees Celsius, tested using Intel Burn Test.
I5 8600k OC model at 4.8GHZ, 1.38V operation, peak performance up to 88 degrees Celsius, tested using Intel Burn Test.
Hey Guys,
I was adjusting my i5 8600k to 4.8GHZ at 1.38V the night before, following the instructions.
The stress tests showed a peak temperature of 74DegC, which is still within acceptable limits for me.
However, during the Intel Burn Test, the chip ran smoothly without any crashes, though the peak reached about 88DegC—slightly higher than I expected.
Keep in mind I plan to use this PC mainly for gaming and possibly streaming, but not for anything else.
Could you let me know if it can maintain that performance level? Thanks a lot!
Use Asus RealBench to obtain real-world temperatures. Programs such as IBT, Prime95, and AIDA64 may cause your readings to rise significantly beyond normal limits. You should be okay.
Majerus.sven:
Hey everyone,
I was pushing my i5 8600k to 4.8GHZ at 1.38V the night before, following the instructions.
The stress tests from AIDA64 reached a maximum temperature of 74DegC, which is still within an acceptable range for me.
However, during the Intel Burn Test, the chip ran smoothly without any crashes, though the peak temperature was about 88DegC—slightly higher than I expected.
Keep in mind I plan to use this PC mainly for gaming and possibly streaming, not for anything else.
Would you mind letting me know if it can maintain that performance level? Thanks a lot.
Majerus.sven wrote to the group about his recent experience with overclocking an i5 8600k. He achieved a speed of 4.8GHZ at 1.38V and found stress tests from AIDA64 to be within acceptable limits, though Intel Burn Test showed a peak temperature of around 88DegC which he considered slightly high. He mentioned using the PC mainly for gaming and streaming, not for heavy computing. He asked for advice on whether the current settings would remain stable.
Intel Burn Test is a very intense stress test.
How intense could it be?
More intense than streaming, recording, gaming, and downloading all together on my 1800X.
It creates an unrealistic workload. Don’t worry—even under the worst conditions your CPU stays well below the 105°C throttling point.
Intel Burn Test is a very intense stress test. How intense, perhaps? More than streaming, recording, gaming, and downloading all at once on my 1800X. It's an unrealistic workload. Don't worry, even under this worst-case scenario your CPU stays well below the 105°C throttling point. This comment made me smile—it's just that I was gaming, running the test, watching a movie, and having a few browsers open with two monitors (HwMonitor and Speccy). Somebody else was experiencing temperature problems.
Someone shared details about AIDA64 reaching a peak of 74 degrees Celsius. IntelBurn Test also reached around 88 degrees Celsius. On behalf of Tom's Moderator Team, we're pleased to have you here! AIDA64 lacks test combinations that provide clear thermal data, and Intel BurnTest demands close to a 120% workload. The recommended operating range for core temperatures is as follows: Temperatures over 85°C should be avoided. Lower temperatures under 80°C are preferable. Core temps fluctuate with ambient conditions. Friends, Intel benchmarks processors at full TDP to confirm thermal specs. Prime95 version 26.6 offers Small FFTs that work well for CPU thermal analysis due to consistent 100% workloads and stable core temperatures typical for Core i models with Hyperthreading and dual-core designs. No other tool matches Intel's proprietary testing setup closely. Whether focusing on thermal or stability, the aim is to run reliable utilities that establish a solid thermal baseline without overloading or underloading the processor. Here’s a summary of popular tools categorized by thermal and stability tests, based on TDP percentages across five generations at standard settings: TDP... Thermal Test - Steady Workload - 129%... Prime95 v27.7 through v29.4 - Small FFTs (AVX, No Offset) 101% Prime95 v26.6 - Small FFTs 89%... HeavyLoad v3.4.0.234 - Stress CPU 87%... FurMark v1.19.1.0 - CPU Burner 78%... CPU-Z v1.83.0 - Bench - Stress CPU 66%... AIDA64 v5.95.4500 - System Stability Test - Stress CPU TDP... Stability Test - Fluctuating Workload (Peak) - 123%... OCCT v4.5.1 - CPU: OCCT (AVX, No Offset) 118%... LinX v0.6.5 - Default 116%... IntelBurn Test v2.54 - High 113%... OCCT v4.5.1 - CPU: Linpack (AVX, No Offset) 110%... AIDA64 v5.95.4500 - System Stability Test - Stress FPU 99% % Asus RealBench v2.56 - Stress Test (AVX, No Offset) 97%... Intel Processor Diagnostic Tool v4.1.0.24 - Default 94%... Sandra 2017.09.24.41 - Burn in - Processor Tests 92%... CineBench v15.0 - CPU - Render Test 79%... Intel Extreme Tuning Utility v6.4.1.15 - CPU Stress Test From the table, Prime95 version 26.6 stands out as optimal for thermal evaluation. This is the tool Real Temp relies on for Core temperature monitoring. • Prime95 v26.6 - http://www.mersenneforum.org/showthread.php?t=15504 Asus RealBench runs a realistic AVX workload and excels in stability checks. It's the preferred utility for CPU stability assessments. • Asus RealBench - http://rog.asus.com/rog-pro/realbench-v2-leaderboard/ In this table, all evaluations indicate 100% CPU utilization in Windows Task Manager, irrespective of actual workload. Higher TDP tests generally lead to elevated core temperatures. Factors like microarchitecture, core count, speed, voltage, and BIOS settings influence results. About Prime95: Generations 2 through 8 support AVX (Advanced Vector Extension). Versions after 26.6 process AVX code in the CPU's FPU, which can push temperatures up by up to 20°C beyond safe limits. Other high-TDP tools yield comparable outcomes. AVX can be turned off in Prime95 versions post-26.6 by modifying the local.txt file. However, since core temps remain similar, sticking with 26.6 is simpler. AVX doesn't impact Core i1, Core 2, Pentium, or Celeron chips due to missing AVX support. For applications like rendering or transcoding, consider lowering Vcore and core speed, or upgrading your cooling solution to maintain stability and manage temperatures. Many 6th, 7th, and 8th Gen boards address AVX limitations with BIOS offset adjustments (e.g., -2 or -3 at 200/300 MHz). Prime95's default Blend test uses a fluctuating workload for memory stability checks, while Large FFTs combine CPU and memory testing. Both have unstable workloads, making them less ideal for thermal evaluation. Stability tests like OCCT exceed 120% workload, which is unsuitable for CPU thermal analysis. By default, OCCT stops tests at 85°C. SpeedFan charts display 13-minute cycles illustrating each test's thermal impact. Observe the steady thermal profile of Small FFTs, Blend, Linpack, and IntelBurn Test. This steady behavior is key for accurate core temperature readings. A consistent 100% CPU load in Task Manager ensures thermal stability across the board, cooler, socket, motherboard, and voltage regulators. Although AIDA64's CPU test maintains a stable workload, it falls short of TDP requirements, making it inadequate for thermal assessment. Other AIDA64 CPU combinations also produce fluctuating loads, which are not optimal for this purpose. For further guidance, refer to the Intel Temperature Guide: kgt1182 shared that the CPU remains well below the 105°C throttling limit. For clarity, third-gen Ivy Bridge CPUs hit 105°C, while 4th to 8th Gen reach 100°C, and the i5-8600K (5th Gen) operates at 96°C. The correct throttle temp for the i5-8600K is 100°C. Product Specifications: Intel® Core™ i5-8600K Processor - https://ark.intel.com/products/126685/In...o-4_30-GHz
Majerus.sven is reaching out to the group. He mentions he recently increased his i5 8600k to 4.8GHZ at 1.38V and found stress tests to reach a peak of 74°C, which he considers still fine. He notes that during Intel Burn Test the chip ran without crashing, though the temperature peaked near 88°C—slightly above what he finds acceptable. He asks for advice on whether this level is safe, especially since gaming and benchmark temperatures should be lower than the stress test readings. He also reminds others not to worry as long as gaming and benchmark temps are within limits.