[Athlon64] Possibly THE fix for the RS480M2!

No, not a joke about liberal use of a sledgehammer here... 
Okay, I think, after literally about two dozen reinstallations of Windows, that I have narrowed the problem (all of them - Depending on other settings, I can reproduce just about all of the complaints I've seen here, but this one seems to cause the actual underlying flaw that the rest simply modify) down to a single BIOS (v3.3) setting:
Set your MPS mode to 1.1 (this requires turning APIC on first, and you should then leave it on).  You might want to clear CMOS first (note that neither of the "official" methods actually do a full clear, you must unplug the system and take the battery out for a few hours.
As I understand it, this should have no real meaning on a single-processor board, but it makes a world of difference.  I had commented about a week ago that turning off APIC seemed to help, but not entirely.  I now see that I should have explored that partial fix just a little bit further.  Well, at least I finally got it right.   
If anyone can confirm this on their own box with a similar setup to my own, it would probably help a LOT of people out.
Note that I have not tried the 3.4 BIOS, and since I finally have this miserable board working, I probably won't flash the BIOS again until/unless I absolutely need to for dual core support (if MSI even decides to support them on the RS480M2 line).
As a warning, you will need to reinstall windows after changing this - at the very least, a repair install - in order to fully benefit from it (and quite likely, Windows won't even boot anymore after changing this, until you reinstall).  With XP pro (SP2 slipstreamed), you should only need the MSI drivers for the audio, video, and SMBus (and I installed AMD's Athlon 64 drivers for XP as well, though you don't totally need to, unless you want C&Q to work correctly).
If a couple people post negative responses, I'll post my full BIOS settings some someone to try.  But, I think I reduced the problem to this one setting.

@pla
I'm all for tweaks that stablize the ATI motherboard. On the surface I don't see how changing the MPS from version 1.4 to 1.1 will do anything. MPS version relates to Multi-Processor Specification. It should only affect multi processor boards. I would be surprised if it actually did anything on the RS480M2. Especially since it is such a legacy setting that only affected operating systems prior to Windows NT.
That being said, I'm game to try other settings and there is the remote chance that this change could affect how IRQs are handled by the board. The following is a quote from Intel about the differences in MPS 1.1 vs 1.4.
"MPS version 1.4 added extended configuration tables to improve support for multiple PCI bus configurations"
I still have a PCI TV Tuner problem that I think is related to IRQ conflicts with the onboard NIC. I'll try it and see if it does anything for me.
-jonatj

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