Can temp drop this much with fans on?

warlock110 · 06-12-12, 10:37 PM

I just cleaned up my notebook heatsink, and replace the thermal pad with AS, the unit idle at around 40-45C when the fan isn't on, but when the fan is on it drop to as low as 20C but mostly around 25-30C when i'm doing light stuff, which IMO might be too good to be true?

can someone confirm? lol. This is one of those rare situation since I normally do desktop and with that the fan is always on, I don't have much experience running computer with the fan completely off.

This is the older core2duo CPU we're talking about T5600.

Knufire · 06-12-12, 10:40 PM

The drop is reasonable. Extremely minimal airflow is MUCH better than no airflow at all. Replacing the thermal pad with AS5 probably also helped quite a bit.

20C is low though. Seems to me that it's reporting a consistent amount off, but not a major amount. Mobile CPUs still have a significantly lower TDP than their desktop counterparts.

bluezero5 · 06-12-12, 10:50 PM

within expectation.

with fan and without fan is the difference between passive and active cooling.
passive cooling only has conduction as its main dissipation, but when you introduce dynamic convection into the system, heat transfer can be easily amplified by the surface area exposed. that's why heat spread all have increased surface area to improve cooling via dynamic convection.

in fact, given the right set of parameters, the difference will be between melting of metal, and just 'warm to touch'. So I find the change within expectation.

cam_miles2003 · 06-16-12, 07:34 AM

Yup, overall temp drop is reasonable, if you're really worried about accurate temps you can get a small mini temperature sensor, they're pretty cheap (google is your friend when looking for one haha)

Conumdrum · 06-16-12, 09:57 AM

Or run a program like coretemp, realtemp, HW monitor. That's accurate

trents · 06-16-12, 11:54 PM

If it's lower than ambient it can't be accurate. What's your room temp. But I agree with what others have said, probably within a few degrees of being accurate.

warlock110 · 06-17-12, 12:30 AM

Quote:

Originally Posted by trents

If it's lower than ambient it can't be accurate. What's your room temp. But I agree with what others have said, probably within a few degrees of being accurate.

it's not accurate, I recheck using coretemp and it's in the 45C to 50C idling without the fan... I had to make sure the heatsink was working by opening up my notebook, run prime 95 on it check the temp and place my hand on the heatsink, it's hot... so the dam thing is working, it's just in a notebook it's a really really tiny sink, so the high temp is kindda expected.

And before I ran istat (it was a hackintosh lol, i was running full SL on it)... dam these notebooks run hot as hell.

muddocktor · 06-17-12, 08:11 AM

When you are running in OSX, try smc fan control instead. I know it read the T5600 (and replacement T7600) in my mini I used to have with no problems. Hopefully it can read accurately when you are running in OSX on your Hackintosh.

06-12-12, 10:37 PM	Thread Starter #1
warlock110 Member Join Date: Jul 2003	Can temp drop this much with fans on? I just cleaned up my notebook heatsink, and replace the thermal pad with AS, the unit idle at around 40-45C when the fan isn't on, but when the fan is on it drop to as low as 20C but mostly around 25-30C when i'm doing light stuff, which IMO might be too good to be true? can someone confirm? lol. This is one of those rare situation since I normally do desktop and with that the fan is always on, I don't have much experience running computer with the fan completely off. This is the older core2duo CPU we're talking about T5600. __________________ GA-S3 + E6600 @ 360 X 9 1.4V 2 X 1GB G.Skill PC6400 @ 360 4-4-4-12 2 X 320GB Seagate 2 X 250GB Maxtor 1 X 160GB Seagate 1 X Samsung 18X DVDRW w/Lightscribe Creative Audigy 4 Pro 7600GS @ 550/420 TT Big Typhoon
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06-12-12, 10:40 PM	#2
Knufire Senior Member Join Date: Feb 2010 Location: Bloomfield Hills, MI	The drop is reasonable. Extremely minimal airflow is MUCH better than no airflow at all. Replacing the thermal pad with AS5 probably also helped quite a bit. 20C is low though. Seems to me that it's reporting a consistent amount off, but not a major amount. Mobile CPUs still have a significantly lower TDP than their desktop counterparts. __________________ i7-920 3.8 Ghz \| Venomous-X w/ Panaflo HS \| Sapphire Vapor-X 4890 EVGA X58 SLI LE \| 8GB Corsair Vengeance DDR3-1600 \| 500GB Samsung OEM \| Rosewill 850w \| Thermaltake Armor Series \| OCZ Vertex 2 60GB Secondary Rig: CM Elite 430 \| A8-3870K stock \| Radeon HD 6670 \| 500GB WD Caviar Blue \| 4GB G.SKILL DDR3-1333 \| ASUS A55 HEATWARE
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06-12-12, 10:50 PM	#3
bluezero5 Winner, Rig-o'-the-Quarter Fourth Quarter 2012 Join Date: Mar 2012 Location: Tokyo	within expectation. with fan and without fan is the difference between passive and active cooling. passive cooling only has conduction as its main dissipation, but when you introduce dynamic convection into the system, heat transfer can be easily amplified by the surface area exposed. that's why heat spread all have increased surface area to improve cooling via dynamic convection. in fact, given the right set of parameters, the difference will be between melting of metal, and just 'warm to touch'. So I find the change within expectation. __________________ CM Storm Trooper Chassis - ASUS Rampage 4 Extreme Core i7 3930k 5.0Ghz (1.52Vcore) select1: GTX680 3x SLI @1280Mhz select2: HD7970 GE @ 1300Mhz 32Gb Trident 2400 DDR3 10-10-12-30 T1 Motto: I didn't go water-cooling for an air-cooling Vcore!! My Rig's build log ::: Fans 101: Going Scientific ::: Water Cooling FAQ
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06-16-12, 07:34 AM	#4
cam_miles2003 Registered Join Date: Jun 2012	Yup, overall temp drop is reasonable, if you're really worried about accurate temps you can get a small mini temperature sensor, they're pretty cheap (google is your friend when looking for one haha)
	QUOTE Thanks

06-16-12, 09:57 AM	#5
Conumdrum Mutant Forrespondent Join Date: Sep 2007 Location: Las Vegas	Or run a program like coretemp, realtemp, HW monitor. That's accurate __________________ All stock for now, no need for more, but it's gonna be soon methinks. Giga Xtreme 58 mobo i7 965 ES D0 step Corsair 1600 6 gig SLI GTX470 OC when I need it to 870 GPU/1725 mem EK HF nickle blue top CPU block (free from Eddie) Koolance 470 waterblocks One big loop, two 120x3 rads. Pa 120.3 and XSPC RX 120x3. Swiftech 35x pump with V2 restop. GT AP15 fans. Banchetto Tech Station 120 GB SSD, and a few other drives. 1000W UltraX3 PSU, 900 watt (1500VA UPS 27" ASUS VG 3D/Nvidia V2 3D glasses and 24" Acer H243H UPS is 1500 PFCLCD
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Can temp drop this much with fans on?

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06-16-12, 11:54 PM	#6
trents Senior Member Join Date: Dec 2008 Location: Centralia, WA	If it's lower than ambient it can't be accurate. What's your room temp. But I agree with what others have said, probably within a few degrees of being accurate. __________________ Custom built desktop #1: Phenom II X4 960T Zosma unlocked to 6 cores/4.0 ghz/Noctua D14 CPU cooler/GSkill Ripjaws 1600 2x4gb/Asus M5A97 motherboard/Coolermaster HAF 912/case/OCZ 750W PSU/Nvidia 8800 GTS 640mb GPU/WD Caviar Black 500 GB hard drive Custom built desktop #2: PII X4 955 4.1 ghz, Asus M5A97 motherboard, Coolermaster Hyper 212 plus, Nvidia Geforce 220 video card, Enermax 465W PSU, 2x2gb PNY 1600 ram. Toshiba SatelliteL775 laptop/17.3" display, AMD 3400M APU, 8 gb of 1333 Jesus said, "I am the way and the truth and the life. No one comes to the Father but through me". John 14:6
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06-17-12, 08:11 AM	#8
muddocktor Retired Join Date: Nov 2001 Location: New Iberia, LA	When you are running in OSX, try smc fan control instead. I know it read the T5600 (and replacement T7600) in my mini I used to have with no problems. Hopefully it can read accurately when you are running in OSX on your Hackintosh.
	QUOTE Thanks

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