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I find that entry in the memory allocation list of my computer (Workstation -> Device Manager -> View -> Resource by Type). It takes up 256MB of RAM and I'm wondering what's it good for.

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“intel 945g pci express” is your motherboard, but no idea what is port 2771. –  harrymc Nov 17 '09 at 9:25
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From this Intel document

Root Port: A PCI Express Port, on a Root Complex, that maps a portion of the PCI Express interconnect Hierarchy through an associated virtual PCI-PCI Bridge.

Root Complex: An entity that includes a Host Bridge and one or more Root Ports.

Yeah, some circular definitions going on here.

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