PCI-SIG have announced PCIe 4.0 is on the horizon, with up to 16GT/s or just a hair under 32GB/s transfer rate on a 16x slot. The new standard will also allow devices to use more power, the draw from the slot remains at 75W but external power should be able to exceed 225W without exceeding the specs. This could mean GPUs can continue to emphasize performance over power efficiency, which could lead to some interesting products. There is no specific date for any products to arrive, this announcement is technically for revision 0.9, so it is a not quite ready for prime time. This may disappoint those who read about the new Optane drives, which are capable of x4 PCIe transfer as opposed to PCIe 4.0.
"PCI-SIG, the organization responsible for the widely adopted PCI Express (PCIe) industry-standard input/output (I/O) technology, today announced the release of the PCI Express 4.0, Revision 0.9 Specification, supporting 16GT/s data rates, flexible lane width configurations and speeds for high-performance, low-power applications"
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