How much slower is a GPU placed in Gen1 x8 PCI Express slots versus in a Gen2 x16 PCI Express slot?
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For operations that are constantly updated, like viewport interactive graphics, Gen1 is much slower than Gen 2. For compute-intensive operations that keep the GPU very busy before sending its results across the bus there is nearly no difference between the two PCIX types. In the case of iray and GPU ray tracing, you might see a GPU render faster on a Gen2 slot when the scene is very simple, but nearly no difference on a Gen1 slot when the scene is reasonably complex.