8Gig Port Channel between two 6509s

Hey all,
I have two 6509s that I'm trying to configure an 8 Gig trunk/port channel. I have an 8 port fiber module in slot 3 on both switches. When I use the following command: "set port channel 3/1-8" on it seems to take the command, but if I do "show port channel" it shows two groups:
3/1-4
3/5-8
Is there a limit as to how many gigs a port channel can be? If not, why does it split it like this?
I should also note I'm using dot1q for the trunks using Auto mode on one switch and Desirable on the other.
Thanks,
Scott

I did a show port cap on the interfaces and I didn't see any sort of restriction. I decided to run the command again 'set port channel 3/1-8 on' and for some reason it seemed to work this time. Not sure what changed, but it's working now.
Thanks for your help!

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