Prime95 Question

hey iam running prime95 at priority 10, and it still says %50 usage on task manager??

i know its cause of HE but is prime really working at a proper level? its been running for like 6-7 hrs no probs. so i could assume system is stable?

i also ran 3dmark01 for 5-6 hrs no prob

thx

with no systems spec im assuming yr using an intel system with hyper threading if so you will need to run to instances (spelling??) of prime at the same time