0% utilization, not all threads being used

We have a hp ProLiant DL360 G7 server with dual E5649 cpus. We noticed that only 9 of the threads are being used. Even when stress testing with prime95 only 9 of the threads on node 2 reach 60%. The rest are at 0%. See screenshot below. Any help would be much apprecieated. 

Thanks 

Matt