PCI or PCIe on Mac Pro 2x2 Dual Core

I have what I believe is the first run of Intel Mac Pro's...
It's a 2x2 GHz Dual-Core Intel Xeon Mac Pro
I'm trying to figure out if it has PCI or PCIe (express) cards on the back...
System Profiler just lists "PCI cards" but I feel like maybe at that point they were using PCIe, any help would be appreciated.
Thanks.

They are PCI Express.
http://support.apple.com/kb/SP30

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