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Post by TRow on Jun 8, 2004 23:08:03 GMT -5
The Thermistors on the Rear Exhaust Fans Control the RPM's on the Fan, and Adjust With Heat.
*Free Mod*
Try to Position the Fan's So the Thermistor's Are Closest to the HeatSource's as Possible.
This is Done by Removing the Fan from Its "slip Harness" and Rotating the Fan so the Thermistor is Positioned "CLOSER" to the Heat Sources.
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If Noise Is Your Forte, Then Position the Fans so the Thermistor's are FURTHEST AWAY From Heat Sources.
T.RoW
Post if you have any questions.
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Post by TRow on Jun 12, 2004 22:48:07 GMT -5
Also,
I was doing some experiments in the Lab today;D :
Came Up with This Cheap "Slot Fan Card Blower" using the "Old 92mm Nidec" Exhaust Fan Left Over From the Previous Stage 2 Mod.
*1 Slot Cover w/ Slots: (From Old Slot Blower)
*92mm Nidec R.Exhaust Fan
*6 Wire Ties Various Size
*Powering From 80mm Factory 3 Pin on Mobo: Still Getting Fan Error On Boot!!!
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Being it was a experiment I tried different Theories:
*DO NOT ATTEMPT THIS!!!!NOT ADVISABLE
Being that a Thermistor is Basically Some Compound that when heated will allow MORE current to flow thru. I Bridged the "Prongs" on the Thermistor with some Conductive Wire, and Slid them down Toward the Solder Points on the Fan.
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OMG!!!!!!!Know that Sound when the XPS Starts Up and Sounds Like a Rocket Ship???
Imagine that Constant!!!!!!
I had to shut her down, using windows, and some system or power backup beeps were heard....meaning the Dell Bios Sensed a Fan Peaking at about 18 watts!!! at about 130CFMs!!!
Somethings up with the Fan Bios Control in the Dell Bios. I know Dell senses for "Acceptable RPM Ranges" to Detect Bum fans,lose of connection,etc...For Protection. But thers a LOT of speculation into the Noise/Cooling priorties of a Factory XPS and whether Dell Bios can Overide Higher CFM Operation.
More to come:
T.RoW
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Post by TRow on Jun 14, 2004 8:09:27 GMT -5
Notes from the Lab:
I DO NOT Suggest Powering High CFM AfterMarket FANS from the MOBO!!!!
*High CFM: Anything that Gets Over 5000RPMs!!!!
**You WILL FRY YOUR MOBO!!!
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From my Previous Experiment with a Make-Shift "Slot Card Fan" using 1-92mm Nidec(old Rear Fan).
1. I powered the Fan from the Front Fan Connector on the MOBO.
*I discovered some "System Beeping" Noises when I ran a Benchmark Test with the VGA Overclocked. The Beeping System Noises Stopped, when the Benchmard was Immediately Closed.
**I Also noticed that MBMonitor Recognized and Read the RPMS. Meaning: That the F.Fan Mobo Connector WILL MONITOR FAN RPM's!!!
(The Factory 80mm Fan doesn't have a Tach Wire, only Fan Failure Detect Wire instead.)
***The System Beeping may have been a Dell Setting that Detects if a Fan Goes Haywire....To Alert the User.
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I no longer use the Slot Fan due to the ArticSiver Ceramique Application I did to the VGA Core and Mem Chips on my 9800XT.
My Modified Slot Fan also scared the sh*t out of me too, Be Careful when Powering AfterMarket Fan's on the Mobo. High CFM/High RPM Fans Are NOT RECOMMENDED For ANY Mobo. Why? Because of the hugh amount of incidents where the Fan's Fried the Mobo.
T.RoW
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Post by russell on Aug 20, 2005 15:43:30 GMT -5
In the XPS Gen5, are the two CPU cooling fans controlled by temperature sensors?
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Post by devnull on Aug 20, 2005 16:31:17 GMT -5
Interesting experiment. However, I wouldn't ever want to experience that kind of noise all the time. Yuck
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