It turns out we were misinformed by an incorrect packing slip. I
apologize for the red herring. These are actually Tyan GT20 boxes with
Tyan K8SSA (S3870) motherboards. They have 6 DIMM slots and use a
ServerWorks BCM5785 (HT-1000) chipset. The config of DIMM slots is kind
of weird: there are four nominally supporting the first processor and
two supporting the second, though the processors can read from each
other's slots.
As for mixing RAM, we did try 4x1GB of identical DIMM's, and got the
same problems with i386 CentOS 4.4 . x86_64 is fine.
Dan
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