Thermal Compound resistance?

~~BMG_Cya=-~~ · Jan 29, 2004, 01:00 AM

I just ran a few burn-in tests with Sandra 2004, and noticed my Thermal Compound Cooling
resistance was on average 0.13 Celcius.

Is this good? I have an XP 2800+ (Barton) slightly o'clocked to 2.25 and Win XP...hehe.

Thanks for quick answer to simple question.

~~craig588~~ · Jan 29, 2004, 01:21 AM

what forumula did you use to calculate this? because the different forumulas I have seen give different results. How did you record your room temperature? With a probe inside or outside your case? Did you use all celcius or ferienhieght temps?

If you calculated that correctly you have a setup better than even some of the best watercooling setups.

~~BMG_Cya=-~~ · Jan 29, 2004, 01:35 AM

Calculate? You have me mistaken for someone who knows what they are talking about.

A brief explanation of all the little things there, and what is good and not good,
would be cool

I grabbed just a quick screen of what I'm talking about. Hope that helps you
help me.

~~BMG_Cya=-~~ · Jan 29, 2004, 01:46 AM

The correct wording I should have used is CPU Cooling System Thermal Resistance

~~craig588~~ · Jan 29, 2004, 01:49 AM

sandra must be doing that wrong, because even really high end watercooling systems can only do .14-.15

~~BMG_Cya=-~~ · Jan 29, 2004, 02:06 AM

I looked around...searched at Extreme Oclockers...Anandtech...Overclockers.com...the phrase
was mentioned but explained 100 different ways, and nothing useful.

For the record, I have like...13 fans in my case total, including a Vantec 80mm
(85CFM) strapped to the retail box HS. I also have have 2 other high velocity coolers
up to 100CFM on one of them. The rest are no less than 45CFM.

I have much to learn, but imo now, water sucks. I'm not making tea here.

Air.....lots of it....or vapor (phase change...Prometia) is the only good way to cool things.

Least that's what I believe atm.

I'll look around, and see if there is some obscure reference to this.

Thanks..anyway.

zerodamage · Jan 29, 2004, 02:32 AM

I used to think the same way about water cooling as you. However, much reading around and seeing the extreme OC's you could get from using water cooling and etc has made me a believer. You just have to be patient and careful in what you do. All it takes is one drop to fry your mobo or worse, kill you.

**dj_stick** · Feb 2, 2004, 01:53 AM

hmm if you use purified water, that doesn't conduct electricity, what does conduct are all the little particles in tap water (fluoride, chlorine) n all that stuff that collects from pipes, reservoirs and water treatment.

~~craig588~~ · Feb 2, 2004, 01:58 AM

WATER CONDUCTS ELECTRCITY!

~~BMG_Cya=-~~ · Feb 4, 2004, 06:32 AM

CPU Thermal Resistance is defined this way:

Quote:

Calculating CPU Power & Thermal Resistance

1. For the 1.25Vcore at 1.47 GHz: It is known that at 1.6V and 1.47 GHz, the T-bred core XP dissipates 49.4W. Since CPU wattage is directly proportionate to Vcore:

1.6V squared = 2.56
1.25V squared = 1.5625
The latter figure is 39% lower that the former. Thus at 1.25Vcore, the dissipated power is 61% of 49.4W or ~30W. This result jibes with Kostik's nifty CPU Power calculator utility

2. For the 2 GHz overclocked state: According to the Processor Electrical Specs web page, the Athlon XP-2400+ Thoroughbred is clocked at 2 GHz at 1.65V (the same settings as this overclocked XP1700+) and dissipates 68.3W. However, plugging in those settings for a XP1700+ in Kostik's CPU Power calculator utility yields the higher 71.6W figure. So both numbers are provided.

In any case, as Russ (Rusty075 in the SPCR forums) pointed out, the changes in thermal resistance with a hotter or cooler CPU are to be expected: As the temp of the heatsink goes up, the speed of the air moving across the HS increases, thanks to the "stack" effect. That will drop the °C/W - hence the <0.6°C/W at the maximum overclock ~70W setting. The opposite effect occurs with a cooler CPU -- the airflow decreases, reducing the cooling effect. Hence the 0.73°C/W at the 1.25 Vcore 30W setting.

I decided to run a few tests, 10 Burn tests on the CPU using Sandra.
I'm new to this particular topic so I'm no authority. Interesting though.

First shot shows the Launch screen for the CPU Burn-In Benchmark.
I went ahead and turned on the systems monitor feature in the benchmark.

BURN BABY BURN!!!!...

h34r:

Tests 1-3 show the base or beginning temps, fan speeds, CPU voltages, etc.

Note that by the 6th test my CPUTR has gone from a base/idle reading of 0.11
to a 0.21. (Whatever that means...)

At Run 9...my CPU temp is 36.5 C. I had set the benchmark to cut off at anything
over 39.5 C

Short test...only 10 consecutive runs..but I'm not Vapor-cooled nor was I looking
to even really stress my Air-cooled system.

Finished with an average of 0.18 CPUCSCTR.

nuG · Feb 6, 2004, 11:21 PM

Can you hear yourself think when your computer is on? The room must sound like your wind tunnel testing
sometihng. Thats another reason water is good. But its expensive

~~Crash Override~~ · Feb 6, 2004, 11:33 PM

Quote:

Originally posted by craig588
WATER CONDUCTS ELECTRCITY!

Actually dj_stick is correct

If you use deionized water you can submerge all the components without conducting any electricity but you must make sure it is fully deionized and that you have an airtight seal on it so that nothing can get in

basically it has to be clean room conditions.

~~BMG_Cya=-~~ · Feb 6, 2004, 11:44 PM

Quote:

Originally posted by nuG
Can you hear yourself think when your computer is on? The room must sound like your wind tunnel testing
sometihng. Thats another reason water is good. But its expensive

My rig is loud, but I don't notice it over my Klipsch 5.1's.

As far as water...

I've been to alot of o'clocking sites, and from the temps and performance posts I have seen, I get
comparable temps with most water cooled systems.

Personally, I just don't believe in water both in overall performance and the fact that it's somewhat
tedious to maintain. (Like having an aquarium or something.)

When the whole 64-Bit CPU/MOBO...PCIE vs. AGP...issues get sorted, I'll be looking into phase change.
Most likely Lian-Li/Prometia. Until then I'm g2g...

nuG · Feb 7, 2004, 12:38 AM

I dont have a water cooled system either

Jan 29, 2004, 01:00 AM	#1
~~BMG_Cya=-~~ Banned Join Date: Mar 2003 Location: U.S.A. Posts: 718 Rep Power: 0	Thermal Cooling resistance? I just ran a few burn-in tests with Sandra 2004, and noticed my Thermal Compound Cooling resistance was on average 0.13 Celcius. Is this good? I have an XP 2800+ (Barton) slightly o'clocked to 2.25 and Win XP...hehe. Thanks for quick answer to simple question. Last edited by BMG_Cya=-; Jan 29, 2004 at 01:47 AM.

Jan 29, 2004, 01:35 AM	Thread Starter #3
~~BMG_Cya=-~~ Banned Join Date: Mar 2003 Location: U.S.A. Posts: 718 Rep Power: 0	Calculate? You have me mistaken for someone who knows what they are talking about. A brief explanation of all the little things there, and what is good and not good, would be cool I grabbed just a quick screen of what I'm talking about. Hope that helps you help me. Last edited by BMG_Cya=-; Jan 29, 2004 at 02:21 AM.

Feb 6, 2004, 11:21 PM	#11
nuG is having a sexy party Join Date: Jan 2004 Location: East Coast Posts: 1,779 Rep Power: 0	Can you hear yourself think when your computer is on? The room must sound like your wind tunnel testing sometihng. Thats another reason water is good. But its expensive __________________ [COLOR=Black][/COLOR]

Feb 7, 2004, 12:38 AM	#14
nuG is having a sexy party Join Date: Jan 2004 Location: East Coast Posts: 1,779 Rep Power: 0	I dont have a water cooled system either __________________ [COLOR=Black][/COLOR]

Jan 29, 2004, 01:21 AM	#2
~~craig588~~ Banned Join Date: Nov 2002 Location: In clothing Posts: 3,510 Rep Power: 0	what forumula did you use to calculate this? because the different forumulas I have seen give different results. How did you record your room temperature? With a probe inside or outside your case? Did you use all celcius or ferienhieght temps? If you calculated that correctly you have a setup better than even some of the best watercooling setups.

Jan 29, 2004, 01:46 AM	Thread Starter #4
~~BMG_Cya=-~~ Banned Join Date: Mar 2003 Location: U.S.A. Posts: 718 Rep Power: 0	The correct wording I should have used is CPU Cooling System Thermal Resistance

Jan 29, 2004, 01:49 AM	#5
~~craig588~~ Banned Join Date: Nov 2002 Location: In clothing Posts: 3,510 Rep Power: 0	sandra must be doing that wrong, because even really high end watercooling systems can only do .14-.15

Jan 29, 2004, 02:06 AM	Thread Starter #6
~~BMG_Cya=-~~ Banned Join Date: Mar 2003 Location: U.S.A. Posts: 718 Rep Power: 0	I looked around...searched at Extreme Oclockers...Anandtech...Overclockers.com...the phrase was mentioned but explained 100 different ways, and nothing useful. For the record, I have like...13 fans in my case total, including a Vantec 80mm (85CFM) strapped to the retail box HS. I also have have 2 other high velocity coolers up to 100CFM on one of them. The rest are no less than 45CFM. I have much to learn, but imo now, water sucks. I'm not making tea here. Air.....lots of it....or vapor (phase change...Prometia) is the only good way to cool things. Least that's what I believe atm. I'll look around, and see if there is some obscure reference to this. Thanks..anyway.

Jan 29, 2004, 02:32 AM	#7
zerodamage HardwareHeaven Extreme Member Join Date: May 2003 Location: Virginia, USA Posts: 3,478 Rep Power: 0 System Specs	I used to think the same way about water cooling as you. However, much reading around and seeing the extreme OC's you could get from using water cooling and etc has made me a believer. You just have to be patient and careful in what you do. All it takes is one drop to fry your mobo or worse, kill you.

Feb 2, 2004, 01:58 AM	#9
~~craig588~~ Banned Join Date: Nov 2002 Location: In clothing Posts: 3,510 Rep Power: 0	WATER CONDUCTS ELECTRCITY!