Ok the number I need is in the sticker circled below.
The number will not be preceded by NVLBL and will be formatted P/N xxx-xx-xxxx-xx at least that what you will find on a GTX 280
usually letters and numbers combined.
I searched everything you listed and came up empty.
Who is the manufacturer?
I must admit it sure looks like a Quadro
You may have found yourself one heck of a deal $220 for a $3000.00++ card. If your are running XP 32 bit it would explain the reason all the memory is not showing up, hence worthless without a OS upgrade.
Now one has to ask why would somebody sell it so cheaply.
If they didn't know what they had, that would explain it. I would think something like that doesn't just fall into your lap. Those were just released in Nov 08. So the chances of the original purchaser forgetting what he/she paid for it is slim to non. Even my short term memory is not that bad.
I'd use some caution here if it is a Quadro FX5800 somebody may be looking for it.
Sorry to be so presumptuous here and I certainly hope what I'm thinking is wrong but, it's safe return may be worth a 280 for real.