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November 17th, 2017 04:00
Final update - XPS 8920, CPU fan speed continuous ramping up and down
UPDATE:
I am not say ing people shopuld do this but i found after alot of testing and reading you can undervolt the i7-7700 on a dell 8920 using "Intel® Extreme Tuning Utility"
I used a negative "Core Voltage Offset" -0.110Volts No other features used
(This number HAS to be calculated in small increments till stable as it is dependant on the silicon lottery in your own cpu)
It has been stable for 28 hours so far (tested very agressivly)
So now...
NO cpu voltage spikes and NO cpu temperature Spikes and NO Fan ramping
Other benitifs is my computer now runs 10-15C cooler for no performance drop
There ya go
------------------ Original post below --------------------------
We are replacing older XPS 8700's and i thought I would try this XPS 8920.
The CPU fan speed continuous ramping up and down over very small CPU temperature changes is driving me nuts. I cant find temperature to speed tweak for this unit. 3rd party fan speed controllers all report its only capable of 0, 800, and 4500 RPM (only 3 static values).
Is there a hidden way to control this excessive changes in fan speed and Noise? If not this is a show stopper?
P.S. I am aware the i7-7700 is a stupid CPU with temp spikes but this is not about that. Its about controlling your fans more sensibly.
Please take this serious and help me.
Bryan Mcloughlin
6 Posts
0
November 17th, 2017 06:00
I appreciate the honesty thank you :)
DELL-Jesse L
Moderator
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17.6K Posts
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November 17th, 2017 06:00
Bryan Mcloughlin,
Unfortunately, there is no way to control the changes in fan speed and Noise.
Bryan Mcloughlin
6 Posts
0
November 17th, 2017 06:00
and the fast edit to your reply heheh
Bryan Mcloughlin
6 Posts
0
November 17th, 2017 07:00
After some reading and fiddling I think i found a solution
I7 7700 causes voltage spikes causing cpu temperature hikes and because the fan does not use a good averaging these spikes cause instant ramp up and down on fan speed
Now the good bit (see attachment) droping the maximum processor rate to 99% causes a drop in the base voltage cpu cores this means when it spikes its not enough to caus the temperature and there for the fan speed anoyance :¬)
Of course averaging the cpu temperatures in the bios fan control would be better but im only droping the cpu by 1%
Please check my attached image it explains alot :¬)
1 Attachment
interesting.jpg
DELL-Chris M
Community Manager
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56.9K Posts
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November 17th, 2017 07:00
Bryan, I sent you a private message.
Bryan Mcloughlin
6 Posts
0
November 17th, 2017 07:00
After some reading and fiddling I think i found a solution
I7 7700 causes voltage spikes causing cpu temperature hikes and because the fan does not use a good averaging these spikes cause instant ramp up and down on fan speed
Now the good bit (see attachment) droping the maximum processor rate to 99% causes a drop in the base voltage cpu cores this means when it spikes its not enough to caus the temperature and there for the fan speed anoyance :¬)
Of course averaging the cpu temperatures in the bios fan control would be better but im only droping the cpu by 1%
Please check my attached image it explains alot :¬)
-------------------------------------
i cant attach my image so here is a link
s250.photobucket.com/.../interesting.jpg.html
Bryan Mcloughlin
6 Posts
1
November 19th, 2017 04:00
Answer is now in first post