My supervisor blades have 2 10GE ports and 4 GE ports on them. I have 2 supervisor blades on my 4510. I was wondering if I can use all 8 (4 on 1st blade and 4 on the 2nd blade) at the same time. I do not plan on using the 10GE ports.
Unfortunately I don't believe that will work. You will only be able to use 2 1G SFP's per supervisors giving you a total of four.
When two Supervisor Engine V-10GEs are present in a Catalyst 4510R or Catalyst 4507R switch, two SFP uplinks are active on both the primary (active) and secondary (standby) supervisor engines by default, or four uplinks will be active in a nonredundant configuration.