HPC Doom need more program memory than a simple program.
The wad file 3.88 MB, the program 429 Kb and the necessary memory program needs.Configure you memory with more space to program memory.
Games as PocketQuake run faster with less of 1 MB to storage memory and the rest to program memory on my 680 and 720.
The 680 has only 166Mhz and 16MB RAM.
HPC Doom run faster on my 680,720 and 728.
If your HPC Doom run but the game load stop try in START,RUN and find the file and add -fixvid