light cache max core 100% DR new 24 threads 60%

Using light cache for an interior scene, loaded up one our our nodes which are 2x 5650 that when i look in task manager have 24 threads.

So in lc set the passes to 24. now when i send the scene to that machine with DR on, it only uses 60% but the older nodes whihc are 8 cores use 100%

Any reason for this?

if you are rendering dr from your max session, then it would be 24 + number of threads your workstation has.