Which expansion slots are which.

I am looking to add more firewire 800 and USB 2.0 slots and am wondering which slots are which.
I tried speaking to the technical department at Apple but they could not confirm exactly (amazing really, kinda makes you wonder why they have a technical dept LOL)
I have a new Mac Pro Intel 2 x 2.8 there are four slots
Slot 4 x 4 (nearest the top of the mchine when upright)
Slot 3 x 4
Slot 2 x 16
Slot 1 x 16 (used by the Nvidia 880 graphics card)
I will be adding another graphics card so I assume I will need to use the x 16 slot but my question is, are the other two x 4 slots PCI express.
How do I check how many watts I am pulling, I understand I need to keep within the 300 watt max.
I won't be using the other graphics card very often, it's going to be connected to a 40" Sony LCD for slideshows when clients come round.
I am thinking about adding an sata card in one of the slots and a firewire800/usb 2.0 in the other slot.
Does this sound ok to people?
(if anyone has particular suggestions as to which internal cards to get, I would be more than happy to take some advice)
Thanks Guys.
Jason

I have spoken with them again and got someone who knew what they were talking about this time.
It seems that all 4 slots are PCI Express but the two x16 slots would have to be used for the graphics cards as I suspected.
I will look at firewire800/usb 2.0 for the other slot and maybe an eSATA card for the last.
Would I be better to connect my lacie external drives to the eSATA or the firewire 800?
The sonnet Tango 800 Express sounds good with 2 USB and 2 FW800 externals and maybe another card with 2 eSATA connections.
Suggestions welcome.
Thanks.

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