7700K power/thermal spikes.

Toggle sidebar Toggle sidebar
V

Victor_94

Prominent
Apr 30, 2017
4
0
510
I've put a screenshot instead long explanations. You can see smaller watt spikes there while idle and big watt steppings (50-100 watts) under Intel's BurnOut load test and related rapid thermal surges. Other tests don't behave in this manner. The CPU reaches max 80C so passes long stress or other tests. However, the strange spikes are a reality not just a strange bug during that test. I just can't figure out why they're here, it doesn't look like a cooler failure since the average CPU temps are as expected for 7700K + U14S while ambient 27C. Additional info - stock preferences, no throttlings or performance-degrading after that surges detected.
ziq3wk.png
 
Sort by date Sort by votes
V

Victor_94

Prominent
Apr 30, 2017
4
0
510

Monitoring step is 100-300 ms, forget the exact value. Never saw something like this in benches in reviews. + 15-25(C) withing milliseconds at least calling for an investigation.
 
Upvote 0 Downvote
CompuTronix

CompuTronix

Intel Master
Moderator
Nov 13, 2006
6,374
279
38,240
Victor_94,

On behalf of Tom's Moderator Team, welcome aboard!

At the top of all our Forums you'll see "Stickies" which are informative Threads that are permanently "stuck" in place so they're always available as reference material for everyone's benefit. Near the top of the CPU's Forum you'll see the following Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

The spiking you're seeing is completely normal.

This is from Section 5 - Core Temperature:

"Intel’s specification for DTS response time is 256 milliseconds, or about 1/4th of a second. Since Windows has dozens of Processes and Services running in the background, it’s normal to see rapid and random Core temperature “spikes” or fluctuations, especially during the first few minutes after startup.

6th and 7th Generation processors have "Speed Shift" technology, which is more responsive to changes in workload than "SpeedStep" used on 5th Generation and previous processors. Speed Shift has more clock and voltage levels, which create more temperature spikes than SpeedStep. Excessive spiking is often caused by unnecessary tray startup processes."

"Here's the recommended operating range for Core temperature:

80°C Hot (100% Load)
75°C Warm
70°C Warm (Heavy Load)
60°C Norm
50°C Norm (Medium Load)
40°C Norm
30°C Cool (Idle)
25°C Cool

Highest Core temperatures will occur during stress tests, rendering or transcoding. Core temperatures are lower during workloads which are less processor intensive such as gaming or applications."

Once again, welcome aboard!

CT :sol:
 
Upvote 0 Downvote
V

Victor_94

Prominent
Apr 30, 2017
4
0
510


Thanks. I had read all of them and many other resources before posted my own question. No, the +\-25C in a spot and 50-100W sinus aren't looking like a speed shift\step, IMHO. It looks like this is the next issue https://communities.intel.com/thread/110728 for top 7th and, maybe, 6th generation CPUs. However, it isn't answered by Intel (the same symptoms, if this was normal, there should be just a fast vendor's answer), so, I'm not sure. Please, correct me if I'm wrong.
 
Upvote 0 Downvote
CompuTronix

CompuTronix

Intel Master
Moderator
Nov 13, 2006
6,374
279
38,240
Victor_94,

Some motherboards have BIOS with "Hysteresis" adjustments, which sets a time delay for the fans to spin up relative to spikes in Core temperatures. I'm running a delidded and overclocked 7700K on an MSI Z270 motherboard which has Hysteresis settings. I keep Windows 10 clean and allow only necessary minimal background processes and services to run. Although I experience occasional Core temperature spikes to 65°C, I do not have fan spin up issues.

You might check to see if your BIOS has Hysteresis settings.

CT :sol:
 
Upvote 0 Downvote
V

Victor_94

Prominent
Apr 30, 2017
4
0
510


Thanks, there is no fan problem for me. I have ASUS Z270 + Noctua + Fractal R5. Without a special attention to noise near the case, I can't hear even all fans set to max. Also, I'm able to control fans preferences directly from OS, modern systems are really comfortable (it can even update BIOS in one click). Also, I'm not going to overclock the system now, so, I admit that my question more theoretical than a real problem. Just want to know all important things about my new PC.
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom