ASUS P2B-DS and Celeron 1GHz

[Guest]

So everything I've read on this site told me that I should be able to use an Asus S370-DL slotket with a 1GHz Celeron on my Asus P2B-DS (rev 1.02, latest bios) motherboard. The slotket has the right voltage setting (1.75V) and jumpers for Intel vs Joshua, and Coppermine vs Celeron. So I plug the unit in and I get nothing, absolutely nothing. The CPU fan cuts out a milisecond after the power comes on, as if the board is cutting power to the chip. I was wondering if it had anything to do with the fact that the bus request pins work differently on Celeron vs Coppermine on dual boards. Any ideas would be appreciated.

 

[jclw]

You will 99.999999% need a rev 1.06 D03 board to run Coppermines (Celeron OR PIII) in slockets.

The jumper setting should be on Coppermine, as it is a Coppermine cored celeron. The Celeron setting is used when running the older Katmai cored celerons in SMP. Try it at 1.85V as well.

You'd be the first person I know with a pre 1.06 D03 board to get it to work.

Sorry 🙁

The only other advice I can give you is to get two SECC2 PIII-700E chips, and drop them in (~US$135 each). They MUST be 100FSB and they MUST be SECC2 (slot 1). Wind the FSB up to 112MHz, and you'll have a dual PIII-785.

- JW

 

[Guest]

JCLW,

You are definitely da man!

I have a 1GHz Celeron working in my Asus P2B-DS (it's Rev 4 actually, not as previously stated), with an Asus S370-DL slotket adapter with jumper settings at Intel/Coppermine/1.85V. I'm curious as to why it refused to work at 1.75V, the stated power requirements for the processor. The real estate is a bit tight with the large heatsink. Slot number 1 had some silly capacitors in the way, so I put it in slot number 2. It seems to work fine without the termination card in number 1.

The next adventure is to put another Celeron on the board. According to Intel, Celeron's can't SMP, but I heard somewhere (maybe it was on this site) that with a bit of solder you accomplish this on a slotket or motherboard. Something to do with bus request pins, I believe...

 

[jclw]

Wow!

Good for you!

The reason it won't work at 1.75 is because the voltage regulator on that board only goes as low as 1.85 volts.

Coppermine celerons do not do SMP. The Katmai cored ones could with a little trick.

With that board you should be checking out <A HREF="http://www.2cpu.com" target="_new">http://www.2cpu.com</A>

- JW

 

[Crashman]

You can still run that processor, simply change the detected voltage to 1.80v or 1.85v, depending on whatever the lowest your board supports is, and it should work. But first put a BIOS update on it.

Afraid to run your processor at that high a voltage? I've had Coppermines up to 2.6v without damage, and the system I'm using right now has been running at 1.85v for months. You might even be able to hit the 112MHz FSB setting at that voltage (1120MHz), but make sure your properly cooled!

What's the frequency, Kenneth?

 

[Crashman]

If you want to go Dual, I suggest getting two PIII's, such as the 850, and overclocking, at 1.85v, using another identicle adapter.

What's the frequency, Kenneth?

 

[Guest]

Thanks Crashman,

I'm still a little confused about the voltage limitations of the motherboard. The Asus slotket has on card voltage settings indicating the presence of a voltage regulator. Why should it matter that the motherboard can only support a certain minimum voltage, when the slotket can vary the voltage. What is the mechanism by which the motherboard detects less than say 1.85V (passed to it by the slotket) that then seems to prevent all operation. Whould this check not be done in the bios, which then implies that this is really a software constraint and not some inherent limitation of the hardware on the motherboard?

Thanks.

 

[Crashman]

It's not really a voltage regulator, it works like this:
Every PIII and Celeron has voltage detection pins. 4 of them. By disconnecting or connecting a pin, the voltage detected for that processor is modified. On an OEM system you can use jumper wires or disconnect pins in order to raise voltage levels. Certain slotkets will disconnect or connect these pins for you, using jumpers. If you change the voltage on an adjustable slotket to 1.8v, the slotket simply changes the voltage the motherboard detects, and the real work is done by the motherboard's voltage regulator.
Slotkets with real voltage regulators are sold by Powerleap and cost $49. It's far cheaper to change the voltage of your processor on a less expensive slotket, and it still works.

What's the frequency, Kenneth?