Celeron 566 won?t POST at 850, even at 1.85V; lost cause?

[Nasty Piece Of Work]

CPU is retail, stock fan heatsink, week 28 of 2000, packed "08/02/2000".

Possible reasons:
1. old BX motherboard, AOpen AX6B, with latest BIOS, not on ?recommended list? for coppermine, but haven?t had a problem running c566 in-spec.
2. using ABIT SlotKET !!! convertor; seems unlikely, but I recall a couple of people saying their problem went away when they tried a different adapter.

Note that a 300A at 450/100 works fine in the same system, so it?s probably not AGP or RAM. I have tried setting the FSB to 100MHz both on the CPU card, and in the BIOS.

I have tried every 0.05V step up from default (1.50V) to 1.85V. I figure if it won?t even POST at 850 with 1.85V using stock cooling, it?s unlikely to ever run stable at that speed.

Now here?s what I think is a really useful clue. It requires 1.55V to POST at 708/83. If anyone has a 566 that does 850 at 1.6-1.9V, could they check to see if it POSTs at 708/83 with 1.40V? If it does, then it?s fair to estimate that my CPU would need at least 10% more voltage, which would take it over 2.0V.

 

[compuwiz1]

I don't know your board, but are you setting the voltage on the slotket or the mobo? Try the mobo at default voltage and hard set the voltage on the slotket. Might also try picking up an MSI 6905 Master slotket. I've had cpus that would not even post on the Abit!!! boot up and run windows on the MSI. Finaly, it may just be a bum chip.

 

[Nasty Piece Of Work]

My only option is to set the voltage on the CPU convertor. What about the ASUS and Iwill convertors, are they OK?

 

[Nasty Piece Of Work]

Here?s something I found on AOpen?s site.



<< My Slot 1 motherboard running a Socket 370 CPU with a converter card doesn't work properly, why?

In fact, such converter card (allowing to use a Socket 370 CPU on a Slot 1 motherboard) is not a product of industrial standards; there is no organization, official documentation or specification for it. Although use of this kind of products is not recommended by the CPU maker, many motherboard manufacturers have converter cards available in view of economy and future upgradability, or to make their Slot 1 motherboards accept more types of processors. However, the long, roundabout circuits will very likely make signal quality in systems with converter cards inside not as high as those of Socket 370 motherboards with a PPGA Celeron or Slot 1 boards with a Pentium II/!!!. Therefore it's not a good choice for high performance; moreover, the possibility of incompatibility and instability cannot be ruled out. >>




I guess I should be thankful the bloody thing works at all.

It seems that CPU cards are not created equal. As a stickler for quality parts that are affordable, my aim is now to research the best convertor card.

 

[compuwiz1]

Please look toward the MSI 6905 Master. I've tested many, many cpus on all of them.