How do I determine whether I have PCI Express v1.1 or v2.0?

This article in Mac Fixit states that computers with PCI Express v1.1 slots will NOT be able to take full advantage of OpenCL in Snow Leopard:
http://www.macfixit.com/article.php?story=20090612121357227
... In terms of PCI Express, My Mac Pro is on the cusp. PCI 2.0 was announced in January 2007 and presumably made it's way onto the assembly line a few months after that. I bought my refurbished Mac Pro in June 2007. I can't determine in the System Profiler if I have PCIv1.1 or v2.0. Does anyone know how to find out? MacTracker and machistory.com haven't answered the question. It seems some of the MacPro1,1 models shipped with v1.1 and some with v2.0. How do I determine what I have? Thanks for your help!
SPECS FROM MY SYSTEM PROFILER (SERIAL RM727......)
GRAPHICS/DISPLAYS
NVIDIA GeForce 7300 GT
Chipset Model: NVIDIA GeForce 7300 GT
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0393
Revision ID: 0x00a1
ROM Revision: 3008
PCI CARDS
NVIDIA GeForce 7300 GT
Name: NVDA,Display-B
Type: display
Bus: PCI
Slot: Slot-1
Vendor ID: 0x10de
Device ID: 0x0393
Subsystem Vendor ID: 0x0000
Subsystem ID: 0x0010
ROM Revision: 3008
Revision ID: 0x00a1
Link Width: x16

How do I determine whether I have PCI Express v1.1 or v2.0?
Hi,
Open Apple System Profiler (About this Mac:More info) and look at the Hardware: Model Identifier. If it says Mac Pro 1,1 or Mac Pro 2,1 you have PCIe v1.1 slots.
http://www.amug.org/amug-web/html/amug/reviews/articles/intel/macpro/
If it says Mac Pro 3,1 you have PCIe v1.1 in slots 3 and 4 and PCIe v2.0 in slots 1 and 2.
http://www.amug.org/amug-web/html/amug/reviews/articles/intel/macpro-2008/
If it says Mac Pro 4,1 you have PCIe v2.0 in all four slots.
http://www.amug.org/amug-web/html/amug/reviews/articles/intel/macpro-2009/
Hope that helps!

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