Well, just for Your information: built up such a machine, with K6-2-400
+ 64Mb ram, and got a blasting number of soft errors. It seems to NOT
work with any UDMA configuration.

Well, I overclock the CPU to 450 [110 Mhz bus, with overclocked AGP and
PCI], AND IT WORKS PERFECTLY!!!!!! No more soft errors.

If You are interested, more info available.

Best whishes,
Marco.