Mediator and Voodoo

[rkauer]

Also, anything below 4.85V is not good enough for a heavily expanded system. Swap the PSU for another with better regulation and clean the contacts with IPA and a soft brush (a toothbrush is good for this job).

[kolla]

clean the contacts with IPA and a soft brush

Green King IPA?

[Homer]

- Power supply in accordance with the voltage, never drops below 4.8 volts on 5+ line.

Hi, did you measure the voltage with a multi-meter, or an oscilloscope ? The 5V may be dipping quicker than you can see on a meter.

[easy_john]

Do you have another gfx card for mediator (like another voodoo) to test?

yes, i try two 3000, one 4500 and one 5500.

[easy_john]

Hi, did you measure the voltage with a multi-meter, or an oscilloscope ? The 5V may be dipping quicker than you can see on a meter.

Use only multimeter.
Ok, i understand, that i need retest with new big psu.
Just becouse it's not easy find how to connect atx psu to a4000 mobo.

[mechy]

I second what rkauer says, i have seen a 4000 crash at 4.87v when i was using a old amiganet card, it was fine until i added the load with the transciever on the aui port, and that was just enough to drop it and lock up.

personally i like to see at least 4.9 on a expanded one.Also check the power supply to motherboard connector,its not unusual to find a pin or 2 expanded and not making good contact,and in bad cases the 5v pin has been hot and discolored.

good luck!

Mike

[easy_john]

Thank you very much everybody.
The problem was the power supply, +4.8 is not enough.
I connect (with difficulty) the new ATX 500 watts, the voltage was +4.95 and all the voodoo began working steadily.
Now i'm have to find a replacement board of power supply. Are there any good solutions?