Stefan Mileschin

An increasing number of high-end graphics cards and motherboards are relying on PCI-Express bridge chips to expand the PCI-Express lane budgets, no thanks to the puny number of PCI-Express lanes today's mainstream computing platforms come with. Following the transition to PCI-Express Gen 3.0, with Intel's new platforms (Ivy Bridge and Sandy Bridge-E HEDT), there is a demand for Gen 3.0-compliant PCIe switching hardware, especially x48 bridge chips (which take in a PCI-Express x16 link, giving out two x16 links or four x8 links). Such chips are used on high-end motherboards to expand the number of PCIe slots, and on dual-GPU graphics cards.

It appears like NVIDIA does not have a PCIe Gen 3.0-compliant bridge chip of its own, and so the only company with one, is PLX Technology, with its PEX8747. The chip has been used on a variety of high-end motherboards, and NVIDIA's GeForce GTX 690 dual-GPU graphics card. PLX reportedly saw high demand, which resulted in several companies bagging initial allocations of the chip, leaving others out to dry, with the part being listed as out-of-stock by its maker. Newer clients of the chip will have to wait until PLX undertakes the next big production cycle, to get their allocations of the chip.

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