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The interfaces are legacy-free, using only digital buses such as PCI Express, Serial ATA, Ethernet, USB, and HD audio (Intel High Definition Audio).
However, IAL successes in the hardware world are legendary, and include PCI, USB, AGP, the Northbridge/Southbridge core logic architecture and PCI Express (the now-dominant architecture for multi-processor servers).
However, QPI is used internally on these chips to communicate with the "uncore", which is part of the chip containing memory controllers, CPU-side PCI Express and GPU, if present; the uncore may or may not be on the same die as the CPU core, for instance it is on a separate die in the Westmere-based Clarkdale/Arrandale.
Newer Core and Xeon processors address 40 PCI Express 3.0 lanes directly through Sandy Bridge-E architecture (Xeon) and Ivy Bridge architecture (Core processors).