A7N8X owners, what's your CPU temps? MBM showing 126 C on asus sensor 3 on ASUS A7N8X nforce2, other sensors don't match

[Macro2]

I earlier reported a temperature high CPU temperature in the BIOS of an ASUS A7N8X nforce2 board running a 2400+ and Taisol copper bottom HSF.

BIOS reads 31 C motherboard, 57 C CPU. I thought that a bit high. I added a faster fan and dropped it a C or two.

I installed windows XP and motherboard monitor 5.2.2.0 (latest one) and I get the following readings.

Board Sensor Asus 1 = 31 C OK, 31 C seems like the case temp.

" Asus 2 = 38 C I dunno....hoping that was the CPU...but the BIOS says 56-57

" Asus 2CUSLS2 = 0 C Dunno

" Asus 3 = 126 C * seems to be that right when I turn it on, the others take a few minutes to warm up.

" Asus 4 = 25 C Dunno



Is MBM not reporting correctly, are the mobo sensors mucked up or is some part of my chip running at 126C? Ouch. No where in MBM is there a sensor reading the same temp as the BIOS.

Can someone with this board and MBM help me by posting their temperatures?

 

[mechBgon]

If your chip reached that kind of temperature, the A7N8X's overheat protection would have kicked in a long time ago. Try here for the suggested sensor ID's.

 

[Macro2]

Asus 3 seems to be pegged on 126 C even if I go right to MBM on cold boot so I'm not giving much creedence to that one. Thing probably would have been toast by now if thats true.

Where is the thermal protection settings in the BIOS, I can't seem to find a reference to them...thanks.

38 C socket would be good, no? AMD says the real core temp is 30 C higher than the bottom of the module...hummm

That link says Asus 5 reads the diode. My version of MBM offers no Asus 5 board sensor.

Any idea what the BIOS is reading?

 

[mechBgon]

Here's the deal: I have an older Asus board, the A7V333-RAID. MBM has found a way to get to the CPU's internal diode on the A7V333-R. The speed at which the temperature changes is amazing. Apply a full load and the CPU temp will jump to its loaded temp within five seconds. Take the load off, and it drops to its idle temp within five seconds. There's a little more ramping as the heatsink itself cools over the next 20 seconds or so, but this pretty much eliminates the relevance of a cold boot or a hot restart. The temp of that tiny scrap of silicon just changes too fast for that methodology to have relevance.

If the mobo sees a thermal "panic" situation from the CPU's diode, it will cut power to the whole computer just as if you'd yanked the plug out of the wall (well, ok, the green LED on the mobo will still be lit). I've tripped it four times on two different models of Asus boards and it occurs in a split-second. onOFF! like that. I think you don't want to disable this and revert to manual methods, and rummaging through the manual, I don't see anywhere that you can, either.

If you want to get a feel for your temps, maybe you could edit your title to "A7N8X owners, what's your CPU temperature?" and use Asus Probe as your reference method.

 

[Macro2]

Done

 

[Insane3D]

The Epox 8RDA and 8RDA+ boards do the same thing with certain sensors in MBM...it's a false reading. You would likely be melting stuff @ 120+ C...

 

[chizow]

Did you apply the patch?

Works fine for me, diode readings as well as socket readings.

Chiz

 

[Macro2]

Thank you....


..:: MBMA7N8X.zip ::..

Is that the patch? I saw it but thought it was the thermogamer thing...


Be right back after installation

 

[chizow]

Np, yah thats the patch, but you have to manually apply it by replacing the files in your mbm directory. The readme tells you exactly where to put em. You'll know its working by running Prime95 and watching your temps raise a good 10F or 5C in about 2 seconds

Chiz

 

[Macro2]

Chiz

OK COOL...Thanks

I get 47 C on the one that says diode and same 47 C on the other one that doesn't say Diode.......

What are you getting?

Still wondering why the BIOS says 56-57...bad bios?


Edit, now up to 48 C on the diode.

 

[chizow]

I get about 43C on the "diode" and 38C around the socket idling, diode jumps to around 49-51C under load (Prime 95) and eventually (after about 20 seconds) the socket gets to within 2 or 3 C of that. Double-check your probe settings, I set Asus 1 and 2 to probe 1 and 2 respectively, and the "Winbond XXXXXX diode" to probe 3. Also, make sure you don't select both the Winbond XXXXXX settings like the readme states. I'm not 100% sure that it takes the readings from the diode, it may be interpolated. It seems very accurate though, as the temps are higher and adjust faster when reading from the diode than my bay thermistor touching the side of my core.

Hope that helps,

Chiz

 

[Justorq]

Yeah I was gonna post a thread cuz my temps are at 60C on in the Asus A7N8X BIOS with my 1800+ thoroughbred... I thought that was pretty high considering all the computers I built for friends that were reading lower temps ...
Now I just need to know if the Asus BIOS reads the internal Diode ... cuz im sure it's lower than 60 just because when I touch the heatsink, it's a bit warm, but not 60C warm.

Justin

 

[Hockeyfan6781]

I have the same problem with my a7v8x board... asus probe and the bios show 36-38 degrees full load, while MBM5 shows in the 60's... whats the deal?

 

[Macro2]

All I can say is that theres something funky going on here. I'm wondering if the ASUS bios cpu temp readings are not calibrated right.

MBM diode (asus 3 after the patch) reads 47-50 and the CPU reads 56-58 in the bios....If they are both reading the diode then one is out of calibration.

Interesting article on calibration....LINK

This part is interesting...
"Our tests show that the internal diode in Intel P4 processors read by the motherboard or external circuitry is located in an area of the die that does not produce much heat. Since it is some distance away from the parts of the die that are the main heat sources, it is subject to compression errors similar to external measurements. (Compression errors are inevitable whenever there is thermal resistance between the heat source and the measurement device."

Id this why P4s appear to run cooler? Clever placement of the diode?

 

[mechBgon]

They also have less wattage per square millimeter of contact area.

 

[chizow]

Originally posted by: Macro2
All I can say is that theres something funky going on here. I'm wondering if the ASUS bios cpu temp readings are not calibrated right.

MBM diode (asus 3 after the patch) reads 47-50 and the CPU reads 56-58 in the bios....If they are both reading the diode then one is out of calibration.

Interesting article on calibration....LINK

This part is interesting...
"Our tests show that the internal diode in Intel P4 processors read by the motherboard or external circuitry is located in an area of the die that does not produce much heat. Since it is some distance away from the parts of the die that are the main heat sources, it is subject to compression errors similar to external measurements. (Compression errors are inevitable whenever there is thermal resistance between the heat source and the measurement device."

Id this why P4s appear to run cooler? Clever placement of the diode?

Interesting, but I'd have to say the P4 still runs cooler due to less power draw and heat dissipation. Also, I don't know how the BIOS is getting its readings, but my BIOS temps have always been lower than my AsusProbe temps (or MBM for that matter). I also have a thermal sensor on the side of my core (which obviously isn't completely accurate), but it fluctuates very closely to the temps from MBM/AsusProbe, albeit with slightly lower temps (5F max).

Chiz

 

[Macro2]

RE"They also have less wattage per square millimeter of contact area."

True, not to mention the heat spreader they add.

I don't think the wattage differences are that great...PR rating (Atlon) vs Ghz (for the P4)

What would tick me off is if ASUS offers some BIOS "temperture calibration" update later on...after everyone has pulled their hair out getting there temps down

 

[The Sauce]

Dont worry about the ASUS3 probe. It did that for me too. It defaults to that temp if something is not connected...I can't remember what but it's no biggie.