[CentOS] CentOS 5.1 Core 2 Duo Install freezes

Alrighty.  I'm having a hell of a time and I need help.  I'll try to  
give as much information as possible.

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HARDWARE
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MB:
Supermicro PDSBM-LN2+
Intel 946GZ
ICH7R + Intel® 82573

Memory:
Crucial 512Mb, 1Gb, 2Gb modules matched to above MB.

Processors:
Intel Celeron 420 Conroe-L, 1.6GHz 512KB 64-bit
Intel Core 2 Duo E6320, 1.86Ghz 4Mb 64-bit
Intel Pentium E2140 Allendale (Dual Core), 1.6GHz 1M 64-bit

Hard Disks:
Various Western Digital and Seagate SATA Drives
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BIOS (Rev 1.0 as well as Rev 1.0a)
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Disabled Native Mode
Disabled Native Mode with ACPI
Enabled SATA Native Mode

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KERNEL PARAMS (singularly and combination)
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acpi=off, pci=nommconf, pci=bios, nohz=off, noapic, nolapic,  
pci=routeirq, maxcpus=1
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ATA_PIIX loads at startup, sometimes ACPI depending on my BIOS  
settings.  Always after verifying dependencies, and typically during  
the disk format process, the installation freezes.  I get a "kernel  
panic - not syncing" in text mode.  Single disks, dual disks, LVM,  
no-LVM, software RAID, even when disks are on a Promise SATA300-TX4.   
The single-core Celeron processors work fine, but none of the dual  
core processors work.  I'm using 5 sets of hardware, so bad hardware  
is unlikely.  I'm stumped.

Anyone out there with similar problems and/or workarounds?  Any ideas?

-Ken