Actually, I'm glad it wasn't so apparent. Now I don't feel so bad that I don't have $600 laying around to run out and buy the VSS3.
I ran a test on resource usage for
my Powercore PCI card, and while the VSS3 used 50% of a single DSP chip (there's 4 on the card), it gobbled up 100% of that DSP's memory. So sure enough, I could only run 4 VSS3s. I never use more than 4 verbs in a song (usually 2 or 3), so no big deal, and getting 4 reverbs of that quality for that price is great. That will still leave you with half of each DSPs MIPS for running non time based effects like compression, which don't use memory. The TC Chorus (excellent) is time based, so you'll need some mem left over to run it.
For future reference and others using the search function on this topic;
VSS3 - 50% DSP usage of 1 DSP chip (1/8th of total DSP)
100% of memory usage for that DSP (1/4 of total memory)
can run 4 on a single Powercore
Megaverb - 28% DSP usage of 1 DSP chip (<1/12 of total DSP)
50% of memory usage for that DSP (1/8 of total memory)
can run 8 on a single Powercore
ClassicVerb - 34% DSP usage of 1 DSP chip (<1/10 of total DSP)
50% of memory usage for that DSP (1/8 of total memory
can run 8 on a single Powercore