Fastest pc motherboard with isa slots?

[Iggy]

I'd have to support what everyone else has suggested here.
A Tualatin cored PIII or Celeron would be your best bet.
I've had both of these and not only are they fairly powerful, they're also pretty easily overclocked.
At one time, I had a Celeron from this final core running at 1.6 GHz (and it greatly outperformed a comparably clocked P4 in everything except memory bandwidth).

If you hunt for one, you should still be able to find dual processor boards for the Tualatin PIII.
But remember, not all Tualatins support multi-processor operation.
Still, if you hunt down the right components, a dual processor system with two 1.2 to 1.4 GHz PIII should still be able to run most modern applications competitively.

[Iggy]

Piru may have a point.
The computers my company manufactured in the '80s used an ISA bus w/o DMA and a lot of ISA cards don't use DMA.

If the I/O card in question doesn't use DMA then the boards he's mentioned would be an even more powerful solution.

[Iggy]

... I'll run more tests with the 600mhz board ...
Steven

Sounds like we're back to a high speed PIII as you best, most economical system.

http://www.ebay.com/itm/Tualatin-Pentium-III-S-1-4-GHz-P3-S-1400-512-133-SL657-/150584461806?pt=CPUs&hash=item230f8889ee

1.4 GHz Pentium III $8 + $1 S&H.

Alternately,

http://www.ebay.com/itm/Intel-Pentium-III-1000-MHz-1-0-GHz-socket-370-CPU-SL52R-Top-Coppermine-PIII-/220963433843?pt=CPUs&hash=item3372726d73

1 GHz Coppermine Pentium IIII for increased motherboard compatibility,
$5.49.

[Iggy]

Thanks those are nice priced but...

I'd prefer to just get a board and processor/ram together.

I'm not sure I understand why Steven (because you're probably going to spend more), but if that's the case maybe you ought to look into the previously mentioned Athlon 1GHz board.