As others have said, they can be quite vague.
It is very hard to get the exact POST codes for any given MB sometimes.

I had a couple matching MBs that were getting flaky with the passage of time.
The POST card let me see it was random MB errors and not something
consistant. I think the South Bridge chipset (the I/O) was going.

The only time I used one "a lot" was when I checked lots of CPUs for
someone I met on EBay.  When all other components were "known good"
it was a three or four second test each... (Each was properly installed with
heat grease, etc...)
                                                         Rick Glazier

From: "Gary Tennesen" 
>Has anyone had any experience using a PCI diagnostics card?  It's also =
>known as a POST card.

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