Cel 566 with P2B problem - please help

[Pirx]

Hi

I tried to upgrade my P2B board with new Cell 566 using ABIT adapter.
The board have no voltage settings so I set voltage on adapter to 1.5 and tried it at 66 MHz - nothing (most recent BIOS), it will only boot when I set voltage to 1.8 on adapter, again this is 66MHz. I could go up to ~85MHz with that voltage, but to get it to 100MHz again had to increase it to 1.9v. At that point heat became to be an issue.
My question is why at default speed (66MHz) I had to set voltage to 1.8, is this my board ( no voltage setting on it ).

Also is there any way to adjust voltage on P2B boards?

Any comments/suggestions greatly appreciated.

 

[rigor2]

1. flash the bios to the newest.
2. i believe the asus p2b only does 1.8v and UP (no odd voltages either no .85v)
3. Get a MSI6905 slotket adapter. they rule.

 

[Eug]

It depends on the revision number, but it sounds like your board has only limited support for Coppermine.

If it's Rev. 1.12 or later, there is full support for Coppermine. All voltages, etc.

If it's Rev. 1.02 or later, there is support for Coppermine, but the earlier ones only do it at 1.8 V and higher because of the old voltage regulator's limitations. Some of the later ones fully support all the voltages, but many of them don't. Mine (Rev. 1.10) doesn't do the 1.85, etc. type voltages just like rigor2 said. However, it does do 1.5, 1.6, 1.7, 1.8, etc.

1.8 is fine with a Golden Orb and other OK sink/fans. I've been running 1.9 (533A at 920) for the last couple of months with an Alpha and Arctic Silver - heat is not an issue, but the Alpha is expensive.

I get more stability on my MSI MS-6905 Master slocket than I do with my Abit Slotket !!!, so I second the MSI recommendation. At 960 the Abit lasts about 10 minutes of use in Windows. With the MSI I ran the CPU at 100% usage for 24 hrs before I had one BSOD. At 920 1.8 the Abit is unstable in Windows. With the MSI I can run Windows forever, but gaming locks up the machine.

 

[Pirx]

One more question - is there any disadvantage in running this processor at 66MHz at 1.8v - it's running very cool, can higher voltage make it unstable?

Also thanks for replays, the board is 1.02 rev. so it probably supports voltages starting at 1.8v.

Going to by Golden Orb - hope that helps, thanks again,

-l

 

[rigor3]

more volts= more heat = could mean less stable.