[CentOS] Triple- or Quad-display single-card graphics solutions

So, after some discussion of our new control workstations, we are iterating in on a solution; we are looking at a 1U short-depth SuperMicro SuperServer 5017R-MF with a graphics card in the PCI-Ex16 expansion slot. However, the display requirements have increased to 3 or more monitors for future expansion, so I was wondering whether anyone had any experience with triple- or quad-display single card solutions. Thus far, I have found two promising solutions:

NVidia NVS 510 or 450 Matrox M-series M9138 or M9148

Both these solutions claim to have Linux support, but I was wondering if anyone had any experience with them in CentOS 6.4? And if there were any other solutions I had overlooked?

Thanks, -G. -- Glenn Eychaner (geychaner@lco.cl) Telescope Systems Programmer, Las Campanas Observatory