Yep, that'd do it. The CPU displayed peak is at the hub sampling rate but the peak in your files would represent the best 5 second average power.
-Dave
[edit] Actually I can't recall whether the PT averages samples at lower recording rates or simply drops samples in which case your recorded peak would actually be just one sample out of each 5 second block which 4 out of 5 times won't actually be the peak.