I'll reply to my own question, now that I found the answer the "manual" way. Yes, if you use full-size SFP modules, it only activates the odd-numbered ports. Here is a snippet of "show interface status" :
Gi5/1 notconnect 1 full auto 1000BaseSX
Gi5/2 inactive 1 full auto No Gbic
Gi5/3 notconnect 1 full auto 1000BaseSX
Gi5/4 inactive 1 full auto No Gbic
Cheers,
Matt