The first thing you do if you are sure everyting is ut together roperly. Physically that is, and before you start using tins of time trying to tweak software, is to check you ram.
download memtest86 (standalone mem diag too, bots from a single floppy) and let it run. If the noremal tstes (takes some hours), and you can leave it running in loop, do the hard tests (this will take a day or two, depending on your amout of ram). If your chips are FUd there is no use in spending lots of time tweaking SW.
memtest86 is free, and it also cheks your chipsets. Basically it writes all possible patterns to all lcations in memory, cache, uncahes, idfferent bitwidthts and checks the afterwards. You can aslo check really interesting stuff like wiether your RAM is capable of holding voltage long enough (timeout test writes pattern to entire memory span, wiats 8 hours, and then reads it

)
Yes. RAM malfunctions.. often. like 1000 times a second, the question is if your chips are capable of recovering properly or not
