According to the Wikipedia entry on Cat 5 cable »
en.wikipedia.org/wiki/Ca ··· _5_cable it should be fine:
quote:
Category 5 vs. 5e
The category 5e specification improves upon the category 5 specification by tightening some crosstalk specifications and introducing new crosstalk specifications that were not present in the original category 5 specification. The bandwidth of category 5 and 5e is the same - 100 MHz.