MBM5: Compensation

[sleddog]

What's the general wisdom regarding setting compensation in MBM5?

With my Asus CUV4X the default temps are obviously off -- cpu temp is below room temp.

I've been calibrating by adjusting the idle MBM temp to the idle mobo bios temp. Which gives me a difference of about 12C.

If they're monitoring the same sensor, why do they give different readouts?

 

[Nagorak]

The P3V4X temp sensor is totally inaccurate, I can only conclude that the CUV4X probably has the same problem. I don't know what you can do about it, except maybe by an external temp sensor.

 

[sleddog]

Nagorak (Jan 02, 2001 05:30 a.m.):
The P3V4X temp sensor is totally inaccurate, I can only conclude that the CUV4X probably has the same problem. I don't know what you can do about it, except maybe by an external temp sensor.

There is a BIOS update (1007 - 11/22/2000) that reportedly fixes the problem.

http://www.asus.com.tw/products/motherboard/bios_s370.html#cuv4x

I'm still trying to connect to an ftp server. I'll post back when I get it flashed.

Just my luck -- I setup this system and flashed to 1006 on 11/20/2000

 

[Daniel R]

Anyone know if this problem persists on the CUSL2 i815E mobo's?

 

[sleddog]

No luck.

Flashed successfully, but Asus PC Probe (v2.12) shows a CPU idle temp of 14C in WinNT4. Room temperature is 20C, motherboard is 23C.

 

[cjtune]

Heh heh it might be because of a simple reason: your CPU is REALLY COOLER THAN your mobo. This is possible if your CPU cooling is really effective... My P3-600E@840 can be at 30'C and the mobo at 32 or 33'C without any load (ie. idle) and with the use of 'cooler' programs like Rain or CPUIdle (and that's just with air-cooling). Anyhow, I suppose it is a simple matter of just adding a +12'C to your CPU temp reading unless your CPU temp probe is really screwed up...

 

[cjtune]

cjtune (Jan 03, 2001 10:16 a.m.):
Heh heh it might be because of a simple reason: your CPU is REALLY COOLER THAN your mobo. This is possible if your CPU cooling is really effective... My P3-600E@840 can be at 30'C and the mobo at 32 or 33'C without any load (ie. idle) and with the use of 'cooler' programs like Rain or CPUIdle (and that's just with air-cooling). Anyhow, I suppose it is a simple matter of just adding a +12'C to your CPU temp reading unless your CPU temp probe is really screwed up...

Umm, wait. Does your CPU temp readout vary with CPU load? What is the temp at full load? Add +12'C to it and try to compare it to published values (look around in the forums). If they fall in a reasonable range, then your CPU temp sensor isn't broke but it's the way the mobo adds up the numbers that is faulty and it's just a minor goof on ASUS's part.

 

[klosters64a]

I was surprised that a PEP-66/Delta 38 combo can lower CPU temp below case/motherboard temp. But I've only seen this at idle, and the temp diff aka delta never exceeds 2C.

I really wish MBM 4.18, 5.03 and Asus's own monitoring prog would get the temps right!! It's overdue.

 

[WizardCalledJosh]

I have the p3v4x and the only problem i notice is sometimes it spikes. For example when i access the CD-rom, the temp wil just to 78c for a sec then go back to normal. I have been monitoring the average temps and it seems like they are as close to normal as i can tell with out a second temp monitor. I'd like to get a hold of the fix if there is one, just to see it its realy running hot. I don't think it is though, P3-700@1008mhz working great. I'm getting a SCSI HD and didn't want any extra heat to mess anything up.

 

[sleddog]

OK, here's my temps, unadjusted.

Ambient room temperature: 20C

At Idle:
CPU: 16C
Mobo: 23C

At 100% load (SETI) for a 1/2 hour:
CPU: 31-32C
Mobo: 23C

Cooling consists of Pep66 with Delta, 80mm intake at bottom front and 80mm exhaust at top rear.

Can a Pep66 really reduce the CPU idle temp 4 degrees below ambient? Hard to believe.

What factor does the OS play? I'm on NT4 which does some kind of CPU cooling when idle.

 

[DennisC]

Sleddog, those temps look a lot like mine on my CUSL2 before I checked the temps in the bios, and dialed in about 18-20C compensation in MBM so that it would "look right". (The bios is off a bit, too).

It's like everyone says, ASUS, MBM and the bios just don't agree. I finally quit worrying about the numbers being correct and just use relative changes to see how my system is cooling.

 

[Mykex]

Are you all sure you are activating the right sensors? It sounds like you made just need to switch who is who in the settings.
My board for the cpu it is VIA686A-2 not A-1,Ambiant is A-3 and Board is A-1. These temps are accurate to the bios and flex with use/room temps ect. I might have the ambiant and board messed up but there is no chance on the cpu it always checks right to bios.

 

[sleddog]

No, I'm sure I got the sensors right. I can watch the CPU temp increase when placed underheavy load -- and it is sensor 2.

But GET THIS! Late last week (exactly when I don't know) the CPU temp as registered in Windows by PCProbe and MBM "kicked in", so that the reading is now identical to BIOS.

Temps are now (unadjusted):

Ambient: 20C
Case: 24-26C
CPU w/ load: 31-33C (Seti c/l running)
CPU idle: 28-29C (same as BIOS)

This is with the PEP66 & Delta Black Label and 2 80mm case fans (intake/exhaust, with the case cut so the fans blow straight through).