Old file, numThreads

I have an older file that had numThreads set to 8 (for a specific machine)
on another box that is 2 it is still splitting to 8, anyway to make it default
correctly without using numThreads to set in manually?

Max 2009, Vray 1.5sp2

Yep, set the numThreads to the default value (zero), and V-Ray will calculate the number of threads automatically.

Best regards,
Vlado