I made a mistake with the Si3112 memory...it's at FEAFFC00.

Yes, and this is dynamically assigned by the joint effort of Windows's pci.sys and acpi.sys and the ACPI stuff in BIOS.

issues with flash cards (thumb drives) and NVidia shares an IRQ with
one of the USB controllers.

Probably some issue of nForce, I never trusted the quality of this chipset (this is, BTW, the reason I'm avoing AMD CPUs - the CPU itself is maybe even better then Intel's, but the chipset...).

I don't understand your question. I have two SATA connectors directly
on my motherboard and the drive requires a SATA connector. I don't
seewhere else I could connect it as it has only a SATA connector.

You said you have perf issues with DVD drive attached to SiL controller.

Can you attach it to the usual on-mobo south bridge controller (nForce's or Intel's) instead of SiL? will there be any performance changes?

--
Maxim S. Shatskih
Windows DDK MVP

http://www.storagecraft.com