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1 Rookie

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June 12th, 2024 01:26

Pecision 3620 CPU Fan Tweaking?

Hey folks,

Simple(?) question, I have a resale 3620 (i7-6700, stock fan, not the giant heatsink) that I want to manually tune the fan speeds. I realized that these systems aren't great with airflow and ventilation, so I've added some fans to it. No issues with them, but I'm wondering about the actual CPU fan because that CPU seems to regularly go above 60-70c in intense load situations, which makes the air flow and ventilation a real problem.

I've thought about changing the CPU fan out, but as noted previously here, it can cause boot errors? I've also noticed I don't really hear the CPU fan spinning all that fast, which make me think there's some kind of upper limit to the fan RPM? Which is weird? Basically I'm trying to find a way to override the CPU fan controls for better cooling.

Thanks!

5 Practitioner

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5.5K Posts

June 12th, 2024 02:23

Not sure if software like Fan Control, Speed Fan can adjust your CPU fan but there is an option in BIOS settings to enable fan control override for system fan.

The best option is to upgrade the CPU cooler with tower heatsink.

1 Rookie

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4 Posts

June 12th, 2024 20:02

@Chino de Oro​ Thanks for the response! Earlier I thought the Fan Control setting just disabled the default fan setting and ran them at full speed, no matter what, but nope! Since you mentioned it, I went back and checked and yeah, it basically gives up fan control so I can now Tweak them in Speedfan, which is great. Thanks for mentioning that!

It's very strange but this is the first time I've heard it rev at full 2400 RPM, even though it previously was going pretty high in temps. For future reference, in Speedfan's Fan Control Fan 1 seems to be the CPU, and Fan 2 is the rear/exhaust fan.

6 Professor

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7.9K Posts

June 13th, 2024 04:02

It's the 3630's and 3640's and like chassis that aren't good with airflow.

Good move adding fans.  Since they don't have a way of mounting a front fan, I super-glued one.

I also like Chino's suggestion of going with a larger heatsink.

1 Rookie

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4 Posts

June 13th, 2024 17:41

@bradthetechnut​ Yep! I also went the superglue route. I added a 92mm fan to the inside, behind the front panel and it's definitely improved the air flow. Not the best, but definitely much better. Not sure about the big heatsink though. I've seen it from searching older 3620 threads and it's probably not needed for a non-k 6700? I'm probably obsessing over the thermal numbers more than needed because while I get spikes in the high 60s/low 70s, the average is usually mid 50s.

6 Professor

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7.9K Posts

June 14th, 2024 01:27

Normally, 100°C is listed as a max temp for Intel CPU's.  However, for the i7-6700, a T-Case temp of 71°C is listed.  If you're concerned about temp spikes, the larger CPU cooler may be the way to go if your CPU is regularly under intense loads.

(edited)

6 Professor

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7.9K Posts

June 14th, 2024 01:29

You said you mounted a 92mm behind the front panel.  Does that mean there's room to mount it between the panel and the chassis?  Mine is inside the chassis.

1 Rookie

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4 Posts

June 15th, 2024 06:42

@bradthetechnut​ No it's like yours, inside that chasis. But yeah I think I've figured it out with this cooling thing. So, the fan apps are no-go. The only app that can detect them is HWINFO64, and even with Fan Control Override checked in the Bios, it still doesn't allow tweaking to the fan speeds. HWINFO will try to apply the speeds but it's overridden by the firmware (you can hear the fans revving up & down as it's fighting with it), so I'm just going to get a fan controller, probably pci.

The fans at full speed are quite a bit louder (I normally use headphones on my PC so I don't really hear it), but they're definitely going a great job of cooling as I was only getting max mid 50s (average 40s) after hours of gaming. But I'm assuming having them run at full speed for so long will definitely add wear so I will be getting a controller, and just power the fans directly from the PSU. It's so strange Dell just never lets their fans run at max...

1 Rookie

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2 Posts

June 15th, 2024 18:17

Hey folks,

I have a resale Precision 3620 with an i7-6700 and stock fan (not the big heatsink). I've added extra fans to improve airflow, but the CPU still hits 60-70°C under heavy load. I want to manually control the CPU fan speeds because it doesn't seem to spin fast enough, suggesting an upper RPM limit.

Changing the CPU fan could cause boot errors, so I'm cautious about that. I'm looking for a way to override the CPU fan controls to enhance cooling without triggering these errors.

Any suggestions on how to achieve better fan control or alternative cooling methods would be greatly appreciated!

Thanks!

6 Professor

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7.9K Posts

June 17th, 2024 02:20

@skap97​ 

There's been many posts with some of Dell's other models about the fans running at max and being too noisy.  There's also a YT video of an old Dell PC, plugged in and running a game, being set on fire trying to kill it.  Guess what.  The fans ran on max while there was fire before the thing finally died.  The fire kept going out since PC's aren't made to burn.

The 2 extra fans I added to my 3620 run on max and are fairly quiet.  Like you, I don't hear anything else with the headphones on anyway.

6 Professor

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7.9K Posts

June 17th, 2024 02:32

@Hanira​ 

There is fan control override in BIOS, but the only option is to have them (Dell fans) run on max, which is quite noisy.  I think the easiest bet is the large heatsink with fan.  Be sure the airflow goes the right way flowing toward the back.  Should be an arrow engraved or stickered on it anyway.  Precision 3620 large heatsink on eBay

1 Rookie

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1 Message

June 24th, 2024 17:59

You can use software like SpeedFan or BIOS settings to manually control CPU fan speeds. Upgrading to a more efficient CPU cooler might help, though Dell systems can be picky with third-party fans. Ensure your BIOS is updated, as newer versions may offer better fan control options.

(edited)

6 Professor

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7.9K Posts

June 25th, 2024 02:21

The heatsink I suggested is either Dell or specifically for Dell's, not 3rd party.

1 Rookie

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1 Message

June 25th, 2024 14:27

To tweak the CPU fan on a Dell Precision 3620, enter the BIOS setup by pressing F2 during boot. Navigate to the "System Configuration" or "Power Management" section, then find "Fan Control" or "Thermal Management." Adjust the fan speed settings to your preference, ensuring adequate cooling without excessive noise. Alternatively, you can use Dell's Command | Configure (CCTK) software to manage fan speeds within the operating system. For more advanced control, third-party software like SpeedFan can be used, but it requires careful configuration to avoid overheating or hardware damage

1 Rookie

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1 Message

June 26th, 2024 13:37

To tweak the CPU fan settings on a Dell Precision 3620, start by accessing the BIOS/UEFI setup during startup (commonly with keys like F2 or Del). Look for sections like "Hardware Monitoring" or "Power Management" where fan settings are typically found. Depending on the BIOS version, adjust fan speeds either as percentages or choose from preset profiles (Silent, Normal, Performance). Some BIOS setups allow manual fan curve adjustments for different temperature thresholds. After making changes, save settings and exit BIOS. Monitor system performance to ensure temperatures remain within safe limits. Optionally, Dell may offer a utility for more detailed fan control. Always exercise caution when adjusting settings to balance cooling efficiency with noise levels, ensuring adequate system cooling to prevent overheating.

1 Rookie

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1 Message

June 26th, 2024 13:47

To tweak the CPU fan on a Precision 3620, you can usually access BIOS settings or use software provided by Dell. Start by entering BIOS during startup (usually by pressing F2 or Del key) and navigating to the section related to hardware monitoring or fan control. Here, you can adjust fan speeds or choose different profiles like silent, performance, or custom.

Alternatively, Dell may offer software tools like Dell Power Manager or Command Center, which provide more user-friendly interfaces for adjusting fan speeds based on workload or temperature thresholds.

It's important to balance cooling performance with noise levels and ensure you don't exceed safe operating temperatures for your CPU. Experiment with different settings to find the optimal balance for your needs. Always monitor temperatures after making changes to ensure stability and performance are maintained.

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