I looked at some info and it looks like you can. I came across this fourm post:
http://www.iamnotageek.com/showthread.php?t=66320
Quote:
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CAT 5E is intended for GbE but it's recommended that you use CAT 6 for data integrity if you do alot of video conferencing/streaming/whatnot over your network. I believe CAT 5E/6 also has a longer effective range before signal dropoff/degradation occurs
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Might be something more to research there since that sounds like what you guys are doing.