Hmm, i was at Q3D on a Saturday too, missed my Chance to meet Hank.

Well, but i think the 3dfx building in Fortran Drive should still stand? At least it did so last year, when i was there. I dug up the pics, but please be patient, they will not load very fast.
This was 2006 at 4435 Fortran Drive, not all too far from Quantum3D (easily reached by car).
Here we go:
The building from a distance:

3dfx' old parking lot:

The sign and our rented cadillac in which we drove through California, Arizona and Nevada:

Me standing by the sign:

The sign at close range:

The building at close range (it was locked, so we couldn't get in):