Safety cut-off?

**pentium** · 01-24-2007, 01:17 AM

Re: Safety cut-off?

It sounds like an overload to me.
Did you install anything new?

**Rainbow** · 01-24-2007, 02:15 AM

Re: Safety cut-off?

If you get 13V and like your HDDs (and data), replace the PSU.

**stevo1210** · 01-24-2007, 03:12 AM

Re: Safety cut-off?

Well, I just installed a new HDD.... but that HDD was perfectly fine in another PC. I also added a network card.... And also, it just happened again?! For now, I'll try my best to see whats going on.

[EDIT] I just checked it again and the ATX power connector was a little loose? could that have been the problem? [/EDIT]

Thanks.

**willawake** · 01-24-2007, 03:53 AM

Re: Safety cut-off?

I turned on this PC and then after about 3 seconds into the boot process (No Video Yet) my PC just turns off.

like when your hdd spins up?

**WNG** · 01-24-2007, 03:54 AM

Re: Safety cut-off?

I have the very same Asus board and cpu, except overclocked to 866 MHz.
Very reliable board.

Did your power switch jam? The de-bounce circuit could have kept it from restarting.

Regarding voltage, don't just rely on the BIOS or AsusProbe outputs. Verify with a Digital voltmeter off a spare power plug while the system is running.

If you have a cheapo PSU, it may not be able to handle the extra hardware you just added.
Without system details, we can only suggest the obvious. And yeah, a loose power plug isn't good.

**stevo1210** · 01-24-2007, 04:13 AM

Re: Safety cut-off?

Originally posted by willawake

like when your hdd spins up?

Thanks Willwake,

Yeah, when my HDD spins up. Then after that it just turns off and i cant get it back on.
However, I have plugged the ATX connector in tighter and so far everything has been OK, but i'll keep an eye on it.
This motherboard is one of the best I've had and nothing like this has ever happened before.

**stevo1210** · 01-24-2007, 04:21 AM

Re: Safety cut-off?

Originally posted by WNG

I have the very same Asus board and cpu, except overclocked to 866 MHz.
Very reliable board.

Did your power switch jam? The de-bounce circuit could have kept it from restarting.

Regarding voltage, don't just rely on the BIOS or AsusProbe outputs. Verify with a Digital voltmeter off a spare power plug while the system is running.

If you have a cheapo PSU, it may not be able to handle the extra hardware you just added.
Without system details, we can only suggest the obvious. And yeah, a loose power plug isn't good.

Thanks WNG,

How did you overclock it to 866MHz? I've tried to switch it to 866MHz in the BIOS before and by the time it loads Windows XP, the computer restarts itself. I'm not an overclocker so i don't know how to overclock this 650MHz chip properly.
I've also checked my power switch and it isn't jammed at all.

Here are my System details:

*Intel (R) Pentium (R) III 650MHz CPU. (Slot 1, 100MHz FSB)
*2X 128MB Crucial brand Memory Modules. (100MHz, CL2, SDRAM)
*64MB NVIDIA MX4000 AGP 8X Graphics Card
*Intel 10/100 PCI LAN
*56K PCI Modem
*LG 52X CD Burner
*Mitsubishi Floppy Disk Drive
*Western Digital WD200 20GB ATA-100 HArd Disk Drive

and last but not least.

*Generic ATX Case with a very cheap and so called 250W "Ming Tong" ATX Power supply.

**WNG** · 01-24-2007, 05:00 AM

Re: Safety cut-off?

Make sure the cpu and heatsink uses a true heatsink compound between them, and not any thermal 'tapes', or solid phase change transfer materials.
These other products causes the cpu to run too hot when overclocked.

Set your BIOS to "866 MHz"
cpu/memory divider is 1/1.
CPU Vcore is set to 1.75V

In the chipset config screen, set your RAM timing to SPD.
All other options are ENABLED.

That's it. I ran well under Win2k sp4, and now it's running Ubuntu Linux.

My board is flashed to beta BIOS 1006.003.
But it shouldn't be necessary since this version is for recognizing faster cpus.

Good luck!

**stevo1210** · 01-24-2007, 05:08 AM

Re: Safety cut-off?

Will the stock/original heatsink work for overclocking?.... Or do I have to get one of those special heatsinks?

**PeteS in CA** · 01-24-2007, 11:58 AM

Re: Safety cut-off?

Just a short while ago I turned on this PC and then after about 3 seconds into the boot process (No Video Yet) my PC just turns off.... no warning.... nothing.
I try to turn it back on.... but it didn't turn back on. I didn't smell anything burn or see anything burn at the time this happened.

Then I waited a while.... removed all extras e.g HDD, CDROM, FDD. Then booted it again and it came up...

Sounds like the P/S thermal shutdown circuit (if it has one) tripped. Those circuits usually have built-in hysteresis so the circuit trips at X degrees, but remains latched until the sensed temperature falls to (X - 10) or (X - 20) degrees. Maybe that new HDD added just enough extra load to cause thermal shutdown.

**WNG** · 01-24-2007, 03:32 PM

Re: Safety cut-off?

Originally posted by stevo1210

Will the stock/original heatsink work for overclocking?.... Or do I have to get one of those special heatsinks?

Although I have an OEM cpu with aftermarket HSF, the retail stock one is fine.
If you have the retail cpu, remove the heatsink and remove the thermal tape and substitute with something like Arctic Alumina or Silver compound.

**stevo1210** · 01-24-2007, 07:00 PM

Re: Safety cut-off?

Thanks WNG, I got it working now without Windows XP restarting. I'm not familiar with overclocking but.... if I leave it overclocked like this, will the CPU become slower at a lower clock speed or suffer something similar to "Sudden Northwood Death Syndrome"? At the moment I havent changed the Core Voltage yet.... it is still on 1.65V and also, i am still using the stock cooling equipment.

At least the PC can boot now.... I think that the loose ATX connector was the culprit of the mysterious cut-off?

**linuxguru** · 01-24-2007, 11:41 PM

Re: Safety cut-off?

Possibly bad caps in the PSU, maybe on the +12v rail. That would account for both the overvoltage as well as the shutdown on HDD spin-up.

**WNG** · 01-25-2007, 01:58 AM

Re: Safety cut-off?

No, the cpu won't suffer the so-called SNDS. The Coppermine core is a .18 while the Northwood is .13. Sounds like those guys pushed their luck with too much Vcore.
Coppermine Vcore range is 1.65-18V.

Running at stock, what is your temp reading in BIOS?
Just curious.

**stevo1210** · 01-25-2007, 02:01 AM

Re: Safety cut-off? Failed Overclock?

After overclocking it up to 866MHz, I got a few blue screens and the CPU temperature was only around 55 degrees celcius in the Asus PC probe (maybe that was too hot for a Pentium III?)

The Blue screen says:

MACHINE_CHECK_EXCEPTION

TECHNICAL INFORMATION:

*** STOP: 0x0000009C (0x00000001, 0X8054DA70, 0XF2000000, 0X00000115)

Beginning dump of physical memory
Physical memory dump complete.

What happened? Do I have to give up overclocking now and buy a new processor instead?

Thanks.

**stevo1210** · 01-25-2007, 02:21 AM

Re: Safety cut-off?

Originally posted by WNG

No, the cpu won't suffer the so-called SNDS. The Coppermine core is a .18 while the Northwood is .13. Sounds like those guys pushed their luck with too much Vcore.
Coppermine Vcore range is 1.65-18V.

Running at stock, what is your temp reading in BIOS?
Just curious.

Wait.... My CPU isn't a coppermine.... it is a Katmai. Maybe coppermines are better at the overclock?

**WNG** · 01-25-2007, 02:29 AM

Re: Safety cut-off?

If the 650 won't hold stable at 1.8V, then your cpu isn't able to overclock to 866.
55 degrees C is higher than mine, I get around 43-50C. Might be running a bit too hot.

You don't necessarily have to give up. Before I properly compounded the heatsink. My 650 couldn't handle 133 FSB. So, I ran it at 124MHz with a 31 MHz PCI clock very stable.
You can attempt that until you get the chance to inspect the heatsink. See if XP will run stable on it.

**WNG** · 01-25-2007, 02:36 AM

Re: Safety cut-off?

AHHH! That explains things.
Katmai cores are tough to overclock that high. You can't get 866.
The best you can hope to do is 10 MHz over 100.
Try small incremental steps.
Sorry, but I don't remember the voltage range of Katmai's. I know they start at 2.0V.

Oh well.

**Rainbow** · 01-25-2007, 03:34 AM

Re: Safety cut-off?

There's no 650MHz Katmai. The fastest one is 600MHz.

Safety cut-off?

Safety cut-off?

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