I Have new server i7-4930k / 32GB RAM / 240GB SSD
I would also split into 50 sites, which would be the best settings.
CPU usage (CPU) =
Number of cores for LVE (nCPU) =
Virtual Memory (vMEM) =
Physical memory (pMEM) =
Concurrent connections (EP) =
Number of processes (nPROC) =
I/O limit (IO) =
Number of inodes (soft|hard) =
These numbers are all very relative to each other. You've given us very vague descriptions to work with.
For starters; what sites are these? If they're using PHP and MySQL then yes, they'll need larger chunks.. But when you put it into perspective:
240/50 = 4.8GB per site
4/50 = 0.08 slice of your quad core
32/50 = 640MB ram per box