A7N266C Mobo Temps Faulty!

V12|V12 · 07-10-2002, 04:34 PM

Well folks, I hate to tell you but, if you own an ASUS A7N266C mobo... your Temp readings are misleading...

I came in after a nice night of socializing, and I forgot that I had left the industrial air conditioner on! My AMBIENT air temps dropped to a chilling 21.8C, but guess what? Asus's mobo probe says that I'm still IDLING at 40C, while my NorthBridge is at a cool 31C. Check my other posts about this and you'll see that, that 40C idle temp was ALSO recorded while the ambient was a blistering 90.1F!!!! Now some of us have not had the basic physics and thermodymanics courses, but ANYONE can see that there is definately something wrong when you are idling at the SAME temp when it's 21.8C AND when it's 31.77C+... It is NOT physically possible to idle at 40C when the ambient temp has dropped 10degrees BELOW the normal avg temp!

I know that I should get a sep temp monitor or a fancy SMbus reader, but I have not the funds nor the time to invest in making one... can someone PLEASE explain these ridiculous temps!? Thanks

BTW- I'm running 1/2 lines to the Pump, CPU and 3/4 lines from Rad unfortunately going pump---CPU---Rad---Res...soon to switch to Pump---Res---Rad---CPU etc.

XP1600@1.72G@1.789v, Chevette core, Homemade block 4bolted (see pics from previous posts) 600Grit lap, AS-3, 120mm 100CFM+, 1.5" Shroud dist blowing into case. 80mm, 92mm exhausts and 92mm blowhole

pHaestus · 07-10-2002, 05:15 PM

Is anyone still surprised to see Asus and bad temperature monitoring in the same sentence?

bigben2k · 07-10-2002, 05:25 PM

Quote:

Originally posted by V12|V12
It is NOT physically possible to idle at 40C when the ambient temp has dropped 10 degrees BELOW the normal avg temp!

Why not?

Quote:

Originally posted by pHaestus
Is anyone still surprised to see Asus and bad temperature monitoring in the same sentence?

Not anymore. I'm just glad that this whole mobo temp probe fiasco is over, now that Asus (and a few others) are reading the CPU temp diode.

chazz469 · 07-10-2002, 05:36 PM

What's your water temp? Maybe you could record it over a 24 hours period and show us a cycle. You are right about the ambient temps. But if your rad is doing it's job there shouldn't be too much of a variation. My ambient temperature difference between night and day is about 17°C. My PC temps only vary by about 3°-5°C, if that.

Here's an idea of what I was talking about. This isn't EXACT data, it's just something that I whipped up to show my point. Take into consideration that these are educated guesses at temps, not actual logged data. Also the proc temps are idle temps, which my CPU seldom is.

I still believe that your assessment of the inaccuracy/non-functionality of your sensor is correct. Maybe you're just SOL, until you have time and money for an alternate sensor arrangement.

JimS · 07-10-2002, 07:05 PM

I have the Asus A7N266C and the temp. readings I get are some of the most accurate I have ever seen on a mobo. I have checked both NB and CPU temps with probes and compared to mobo temps and they are always within 1-2C. Sounds like you have a bad ASIC chip on your board.

gmat · 07-11-2002, 04:07 AM

[slightly OT] Hell. I've been an Asus unconditional supporter for nearly 10 years but i think my next mobo will be an Epox...
The times when Asus meant 'quality' are going by...

redleader · 07-11-2002, 10:25 AM

Does the A7N266c use the diode? I just ordered one.

MeltMan · 07-11-2002, 10:45 AM

I dont think so...

Diode readers are soo simple to make, gosh, ive got an extra chip in my room, I'll make someone a reader for a fair price. All you have to do is solder two wires on the back of the mobo and plug it into the smbus.

Its so fun to watch your temps jump up 3 degrees when you open a program, then watch the temps drop by 3 when the program is loaded.

It is amazingly more accurate than any probe. Ive got an A7V with the original plug in probe and it is always off of the real load temps by about 4-5 degrees.

V12|V12 · 07-11-2002, 02:51 PM

Okay, here's the pic of my current rig setup... It's a pretty damn good block for just having some scraps and hand tools laying around, if I may say so... I could make some improvements, but It would take tons of time to unbraze everything and rebraze, so I would just rather build another block, since they cost about $5 in material costs, ahah! Time, that's the problem, cutting and drilling... sure would be a HELL of a lot easier with a nice 10" drill press and table saw! But like I said... the sensor HAS to be messed up or something b/c this formula doesn't make Physical sense:

If Amb (ambient) is 31.77C and the idle is avg 40-41C, then a drop in amb to 21.5C and the idle is still the same 40-41C, it's not possible... I don't have nearly the greatest setup, but my components; tubing diameter 1/2 & 3/4" , pump (Via 1300, 370GPH), Chevette Core, 120mm 100CFM+ fan, BLock of massive copper and silver braze...SHOULD be sufficient enough to drop temps with in 7-10C above amb...guess not

V12|V12 · 07-11-2002, 02:52 PM

Shoot, forgot the pic...

chazz469 · 07-11-2002, 03:15 PM

Seen that drawing before. Do you have a pic of the actual block? I agree that the problem is most likely the probe, but I'm curious about the block.

bigben2k · 07-11-2002, 03:48 PM

V12: I don't think anything is actually wrong here. If anything, your temp probe isn't doing very well, so maybe there's a way to physically move it, ever so slightly, so that you get something more accurate. I haven't seen this probe, so I don't know, but that'd be my guess.

On the other hand, if you can setup a CPU diode reader, I think you'd be far more satisfied. (maybe a little dissapointed at your real temps though)

bigben2k · 07-11-2002, 04:04 PM

Here's a pic of the CPU socket probe of an Asus A7V333 (ripped from Toms).

If yours is anything like it, then you know what to do.

mkosem · 07-11-2002, 05:02 PM

ya, the same thing I'm planning on doing to my 8k7a+. pull the lil bastard off of there and use those soldier points to run a wire to the AMD diode pins on the back of the mobo!

--Matt

MeltMan · 07-11-2002, 05:10 PM

I dont know if that will work quite right. I am unsure as to wether the diode uses a different voltage range to report temps. It might work, but i doubt it. A thermal diode is not a thermal resistor.

Good luck man

bigben2k · 07-11-2002, 05:17 PM

Meltman might be right.

Some mobos actually read that socket probe, and calculate the core temp as a result. That probe doesn't read the core, so a little math is required (kindly provided by your BIOS).

pHaestus has a better solution.

MeltMan · 07-11-2002, 05:22 PM

Yes! pHaestus' diode reader was the one that I built. Very small footprint 1"x3/4", plus perfect readings.

redleader · 07-12-2002, 10:55 AM

Quote:

Diode readers are soo simple to make, gosh, ive got an extra chip in my room, I'll make someone a reader for a fair price. All you have to do is solder two wires on the back of the mobo and plug it into the smbus.

How much do you want?

07-10-2002, 04:34 PM	#1
V12\|V12 Cooling Savant Join Date: May 2002 Location: Ohio-State! <--Money Hussle! SUCKS Posts: 292	A7N266C Mobo Temps Faulty! Well folks, I hate to tell you but, if you own an ASUS A7N266C mobo... your Temp readings are misleading... I came in after a nice night of socializing, and I forgot that I had left the industrial air conditioner on! My AMBIENT air temps dropped to a chilling 21.8C, but guess what? Asus's mobo probe says that I'm still IDLING at 40C, while my NorthBridge is at a cool 31C. Check my other posts about this and you'll see that, that 40C idle temp was ALSO recorded while the ambient was a blistering 90.1F!!!! Now some of us have not had the basic physics and thermodymanics courses, but ANYONE can see that there is definately something wrong when you are idling at the SAME temp when it's 21.8C AND when it's 31.77C+... It is NOT physically possible to idle at 40C when the ambient temp has dropped 10degrees BELOW the normal avg temp! I know that I should get a sep temp monitor or a fancy SMbus reader, but I have not the funds nor the time to invest in making one... can someone PLEASE explain these ridiculous temps!? Thanks BTW- I'm running 1/2 lines to the Pump, CPU and 3/4 lines from Rad unfortunately going pump---CPU---Rad---Res...soon to switch to Pump---Res---Rad---CPU etc. XP1600@1.72G@1.789v, Chevette core, Homemade block 4bolted (see pics from previous posts) 600Grit lap, AS-3, 120mm 100CFM+, 1.5" Shroud dist blowing into case. 80mm, 92mm exhausts and 92mm blowhole __________________ XP 1600+ AGOIA-Y (GreenLabel, UNLOCKED!@/ NF7-S 2.0/ PC 2700 DDR 10.5*172FSB(1806/ 1991 high), Vcore 1.792...@84.95Watts --86' Chevette Heater Core --1/2" Vinyl tubes --Via1300-Stealth Mod(QUIET!) ---Home made copper-tube block ---PVC small internal res

07-10-2002, 05:36 PM	#4
chazz469 Cooling Savant Join Date: Jun 2002 Location: San Diego, CA Posts: 150	What's your water temp? Maybe you could record it over a 24 hours period and show us a cycle. You are right about the ambient temps. But if your rad is doing it's job there shouldn't be too much of a variation. My ambient temperature difference between night and day is about 17°C. My PC temps only vary by about 3°-5°C, if that. Here's an idea of what I was talking about. This isn't EXACT data, it's just something that I whipped up to show my point. Take into consideration that these are educated guesses at temps, not actual logged data. Also the proc temps are idle temps, which my CPU seldom is. I still believe that your assessment of the inaccuracy/non-functionality of your sensor is correct. Maybe you're just SOL, until you have time and money for an alternate sensor arrangement. __________________ "I believe that the moment is near when by a procedure of active paranoiac thought, it will be possible to systematize confusion to the total discrediting of the world of reality" -Salvador Dali AMD XP1600+ @1790MHz and rethinking my cooling.... MAZE3 --> DD Cooler Cube --> Eheim 1048 512MB PC2700 DDR MSI KT3 Ultra-ARU 2x 20GB Maxtor in RAID 0 1x 30GB Maxtor --> WinXP GF3 Ti200 @ 240/499

07-11-2002, 10:45 AM	#8
MeltMan Cooling Savant Join Date: Aug 2001 Location: KS Posts: 374	I dont think so... Diode readers are soo simple to make, gosh, ive got an extra chip in my room, I'll make someone a reader for a fair price. All you have to do is solder two wires on the back of the mobo and plug it into the smbus. Its so fun to watch your temps jump up 3 degrees when you open a program, then watch the temps drop by 3 when the program is loaded. It is amazingly more accurate than any probe. Ive got an A7V with the original plug in probe and it is always off of the real load temps by about 4-5 degrees. __________________ MeltMan Lurker Supreme!

07-11-2002, 02:51 PM	#9
V12\|V12 Cooling Savant Join Date: May 2002 Location: Ohio-State! <--Money Hussle! SUCKS Posts: 292	Okay, here's the pic of my current rig setup... It's a pretty damn good block for just having some scraps and hand tools laying around, if I may say so... I could make some improvements, but It would take tons of time to unbraze everything and rebraze, so I would just rather build another block, since they cost about $5 in material costs, ahah! Time, that's the problem, cutting and drilling... sure would be a HELL of a lot easier with a nice 10" drill press and table saw! But like I said... the sensor HAS to be messed up or something b/c this formula doesn't make Physical sense: If Amb (ambient) is 31.77C and the idle is avg 40-41C, then a drop in amb to 21.5C and the idle is still the same 40-41C, it's not possible... I don't have nearly the greatest setup, but my components; tubing diameter 1/2 & 3/4" , pump (Via 1300, 370GPH), Chevette Core, 120mm 100CFM+ fan, BLock of massive copper and silver braze...SHOULD be sufficient enough to drop temps with in 7-10C above amb...guess not __________________ XP 1600+ AGOIA-Y (GreenLabel, UNLOCKED!@/ NF7-S 2.0/ PC 2700 DDR 10.5*172FSB(1806/ 1991 high), Vcore 1.792...@84.95Watts --86' Chevette Heater Core --1/2" Vinyl tubes --Via1300-Stealth Mod(QUIET!) ---Home made copper-tube block ---PVC small internal res

07-11-2002, 03:15 PM	#11
chazz469 Cooling Savant Join Date: Jun 2002 Location: San Diego, CA Posts: 150	Seen that drawing before. Do you have a pic of the actual block? I agree that the problem is most likely the probe, but I'm curious about the block. __________________ "I believe that the moment is near when by a procedure of active paranoiac thought, it will be possible to systematize confusion to the total discrediting of the world of reality" -Salvador Dali AMD XP1600+ @1790MHz and rethinking my cooling.... MAZE3 --> DD Cooler Cube --> Eheim 1048 512MB PC2700 DDR MSI KT3 Ultra-ARU 2x 20GB Maxtor in RAID 0 1x 30GB Maxtor --> WinXP GF3 Ti200 @ 240/499

07-10-2002, 05:15 PM	#2
pHaestus Big Player Making Big Money Join Date: Aug 2001 Location: irc.lostgeek.com #procooling.com Posts: 4,782	Is anyone still surprised to see Asus and bad temperature monitoring in the same sentence?

07-10-2002, 07:05 PM	#5
JimS Cooling Savant Join Date: Jun 2001 Location: Connecticut Posts: 140	I have the Asus A7N266C and the temp. readings I get are some of the most accurate I have ever seen on a mobo. I have checked both NB and CPU temps with probes and compared to mobo temps and they are always within 1-2C. Sounds like you have a bad ASIC chip on your board.

07-11-2002, 04:07 AM	#6
gmat Thermophile Join Date: Mar 2001 Location: France Posts: 1,221	[slightly OT] Hell. I've been an Asus unconditional supporter for nearly 10 years but i think my next mobo will be an Epox... The times when Asus meant 'quality' are going by...

07-11-2002, 10:25 AM	#7
redleader Thermophile Join Date: Jun 2001 Location: The deserts of Tucson, Az Posts: 1,264	Does the A7N266c use the diode? I just ordered one.

07-11-2002, 03:48 PM	#12
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	V12: I don't think anything is actually wrong here. If anything, your temp probe isn't doing very well, so maybe there's a way to physically move it, ever so slightly, so that you get something more accurate. I haven't seen this probe, so I don't know, but that'd be my guess. On the other hand, if you can setup a CPU diode reader, I think you'd be far more satisfied. (maybe a little dissapointed at your real temps though) __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

07-11-2002, 05:02 PM	#14
mkosem Cooling Savant Join Date: May 2001 Location: here Posts: 494	ya, the same thing I'm planning on doing to my 8k7a+. pull the lil bastard off of there and use those soldier points to run a wire to the AMD diode pins on the back of the mobo! --Matt __________________ If you can't cool it, blow it up!! http://www.mattkosem.com

07-11-2002, 05:10 PM	#15
MeltMan Cooling Savant Join Date: Aug 2001 Location: KS Posts: 374	I dont know if that will work quite right. I am unsure as to wether the diode uses a different voltage range to report temps. It might work, but i doubt it. A thermal diode is not a thermal resistor. Good luck man __________________ MeltMan Lurker Supreme!

07-11-2002, 05:17 PM	#16
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Meltman might be right. Some mobos actually read that socket probe, and calculate the core temp as a result. That probe doesn't read the core, so a little math is required (kindly provided by your BIOS). pHaestus has a better solution. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

07-11-2002, 05:22 PM	#17
MeltMan Cooling Savant Join Date: Aug 2001 Location: KS Posts: 374	Yes! pHaestus' diode reader was the one that I built. Very small footprint 1"x3/4", plus perfect readings. __________________ MeltMan Lurker Supreme!

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