I've just been using the Keyclone CPU Affinity, in the Command Editor portion of Set-Up.

WoW 1: Cpu-0
WoW 2: Cpu-1
WoW 3: Cpu-2
WoW 4: Cpu-3
WoW 5: Cpu-3

Each wow has it's own directory. Wow 1 & 2 are on C drive (Raptor 10,000 rpm). Wow 3-5 are on D drive (Seagate 7,200 rpm).