Since each card in a multi-GPU array uses the same data, a PCIe bridge able to map 16 lanes to three or four x16 slots works well. Sixteen lanes sound like a big bottleneck for systems packing multiple graphics cards, but there's more to the story. That capability probably appeals most on high-end office PCs or entry-level workstations. With the Haswell generation, you can connect as many as three cards to the CPU-based PCIe, but the requisite lane division isn't particularly attractive. The biggest bummer for gamers is that Intel's mainstream platforms only expose 16 lanes. ![]() Also fine (most of the time) is an integrated PCI Express 3.0 controller, which enjoys very low latency.
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