LG-81 Shutdown Issue

WJA96 · 20 Mar 2006 at 20:50

I have been running an Abit LG-81 for a while now, but I just obtained an 805 chip and I'm having problems with Thermal shutdowns.

The interesting thing is though - it's not the processor that's shutting down, it's the PWM temperature.

I was using an AC Freezer 7 Pro and the PWM temperature was hitting 115C (I didn't believe the BIOS or AbitEQ values, so I checked with a thermometer (they were bang on).

I have now switched to a Thermaltake Big Typhoon as that blows air down and through rather than across the heatsink.

The PWM is now reading 85C with the case closed, but I still reckon that's very high.

The processor is massively overclocked (4.6GHz) but even at default settings it still sits about 80C.

There is a small heatsink over the PWM and it seems fairy well fixed down but the little pins do not appear to be as firmly pushed down as the one on the Northbridge. I have pushed them down, but I'm not very sure how they work. Do they just push in, or do they push and then twist or something?

Sorry for the long post, all help gratefully received.

WJA96 · 21 Mar 2006 at 08:40

OK - I have now decided that the motherboard CPU sensor is displaying garbage as I used Speedfan to log the temperature readings and the CPU core is reading 32C at default settings but the Motherboard socket sensor is reading 118C.

I have turned off the auto shutdown in the BIOS and so far, so good. The PWM temperature is still 75C at default FSB. I think I'll get one of those aftermarket coolers for it and see if that helps.

WJA96 · 21 Mar 2006 at 08:41

Has no-one else got one of these?

WJA96 · 22 Mar 2006 at 07:39

Well, still on my own I guess - but with the Zalman fanless northbridge cooler fitted I'm down to a PWM temperature of 55C, which is much more acceptable.

There is definitely an issue with the thermal shutdown routine in the BIOS. With it turned off the machine is quick and stable. With it turned on, after about 90 minutes of use it shows 118C on one or more of the sensors and shuts down. Abit forums posts show it has been like this since BIOS release 10 (14 is current).

I suspect that there are a dodgy batch of sensors otherwise they would have fixed this in the BIOS by now.

FirebarUK · 23 Apr 2006 at 16:27

Hi,

Sorry to dig this up.

I've got a Pentium D 805 but am having the problem of getting above 150Mhz on this board (all stock - just wont post at 150 or over, nadda). Apparently this can be an issue. What settings are you using at the moment?

Ta.

WJA96 · 23 Apr 2006 at 19:08

No. dig it up all you like.

Do bear in mind that I'm currently running an E0 540J though, not an 805;

In Softmenu

CPU FSB: 267 (turned it down a bit to save the processor but it runs OK at 286)
N/B Strap as: 1066
DRAM Ratio: 1:1 (400MHz)
PCI Express: 100MHz
PCI: 33.33MHz

CPU Voltage: 1.48V
CPU Spread Spectrum: Disabled
PCI-E Spread Spectrum: Disabled

in PC Health Status

Under Abit FANEQ

CPU1 FanEQ Control: Disabled
SYS FanEQ: Disabled

Also:

CPU Temperature Shutdown: Disabled
CPU Warning: Disabled
Shutdown Fan Fail: Disabled
Fan Fail Alarm: Disabled

DRAM is Corsair 4200 running at 4,4,4,12

Anything else you think you might need?

It should be quite simple if I recall (I have had an 805 in one of these and it went OK) - set the DRAM to 1:1 and then turn up the FSB. You'll find the DRAM is running quite slowly in the beginning (266MHz).

What voltage are you running? Also - what's your cooling like?

FirebarUK · 23 Apr 2006 at 19:38

Thanks for that.

I'm using OCZ DDRII-800 at the moment, haven't fiddled with memory settings.
I've simply just upped the FSB without tweaking any settings at the moment (apart from disabling fanEQ etc). It could be that my RAM is running over spec, although I'd assume it would have dropped down to 557Mhz. Considering I'm a huge AMD user, this is new to me

Cooling at the moment is a stock cooler, but my AC 7Pro will be here tomorrow. I've also got a Presler 920 on its way.

WJA96 · 23 Apr 2006 at 22:15

The RAM is not on a x4 multiplier, it's x2 - so 133MHz RAM runs at 266, not 533. That RAM is DDR2, PC4200 or PC5300 - much quicker than the PC3200 used on AMD systems.

FirebarUK · 24 Apr 2006 at 08:09

Turns out I was running my RAM at SPD, so it was going out of spec. Slapped it on 1:1 and I'm happily chugging away at 3.3Ghz so far. Ta for your help.