Man, this brings back memories of my old 735 with a screaming graphics card. That Parrot pic in my Avatar was at 24 bit depth, and the PEX 3D demo made the DirectX spinning cube look lame.
I'd use the old 8-bit card for now, but if you get the chance, get the higher end card. I still couldn't believe what my old 735 could do, and it was a bit older and less powerful than the Leviathan you lucked up on.
I hope one day to find another HP-UX machine. Unfortunately I sold mine after it broke down, but I hear its new owner is making progress on it and the old HP 318 I had.
Macintosh IIfx running A/UX 3, 160mb hd, 8 mb ram, Radius Truecolor 24 Graphics Accelerator
Macintosh SE/30 running A/UX 3
Apple iMac DV+ 450mhz, 256mb ram, Panther
Compaq Presario 1210 Laptop dual-Booting choice of Win 98 or Damn Small Linux
Compaq Evo T20 former Thin Client running Damn Small Linux
Sun Ultra 5 ,270mhz , 256mb ram, Solaris 9
Acer Aspire 5734z, 2.3ghz Pentium 4500 dual core, 3gb Ram, Dual booting Windows 7 or Zorin Linux
HP Laptop, 1.1 ghz Duron cpu, 384mb ram, Puppy Linux
Power Mac G4, 450mhz, 768mb ram, OS 10.4.11