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July 23rd, 2021 20:00
Vostro 3900 MT - CPU Fan Advice
The original CPU fan is 80 x 80mm, 4-pin AVC DS08025R12U-P195, DC 12V 0.70A 64CFM. It's 8-years old.
I have cleaned the fan and heatsink thoroughly and replaced the thermal paste.
Dell Diagnostics (End of Test Results) - 2021/07/24
CPU Fan
Current: 497RPM High: 2122RPM Low: 494RPM
Case Fan
Current: 1022RPM High: 1024RPM Low: 851RPM
CPU Internal Sensor
Current: 53C High: 67C Low: 43C
Situation:
1. Are the Dell Diagnostics data OK?
2. CPU fan was reinstalled per the Dell Owner's Manual; i.e. with the air-flow arrow pointing away from the heat sink.
3. CPU fan hunting noise is noticeable. When flipped with a finger in either direction, it doesn't spin for long.
4. No air / heat seems to be blowing out of the CPU fan.
5. At shutdown, the CPU fan immediately shuts down. The original Case fan (37.5 SCFM) takes a few seconds to shut down.
Any comments and recommendations would be gratefully appreciated.
All the best.
XPS_Man
5 Practitioner
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2.4K Posts
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August 31st, 2021 19:00
1. Are the Dell Diagnostics data OK? Yes it seems fine
2. CPU fan was reinstalled per the Dell Owner's Manual; A picture would have been great, but in case of bad installation Dell BIOS would have given an error of Fan failure during Boot, so it also seems OK
3. CPU fan hunting noise is noticeable. : Hunting noise, Like clicking/something obstructing the fan
4. No air / heat seems to be blowing out of the CPU fan. They usually don't, yes modern CPUs generate more heat thus require more powerful CPU fans. So depends on the Fan model you chose. MOST OEM fans are of cheap quality and Dell is no exception. It would hurt their profits to put a better quality fan.
5. Working as Designed. You are cutting power from both fans. A large fan would spin longer.
I would recommend :
You can also run CoreTemp which is a Small but great tool for checking CPU temps and compare the numbers ,in order to put stress on the CPU and fan you can run Cinenbench from Windows store. During Cinebench the CPU can go above 90 degree, which is normal the main thing to notice would be how soon it comes back below 60 once test is completed. Shouldn't take more than 30 seconds.
These temps (per your post) seems OK to me : Current: 53C High: 67C Low: 43C