Well, as an Ex-3dfx employee (and seeing as I personally tested a lot of the V5 6000's that were made in the last production run...) I can tell you the following:

First off, all of his V5 6k's are not of the same revision. Notice how some have a silver power connector housing and some have a smaller black one? The smaller black ones are on the 3rd revision V56k.

The silver ones are from the 2nd revision and the power supplies for those are extremely rare --- most if not all of the 2nd generation boards would only run at about 100 Mhz and displayed severe graphic abnormalities in AA. Those are basically junk.

As far as power supplies go, I only see 3 in the picture, and only one of them is the 3rd revision power supply. The other 2 look like laptop power supplies to me.