Jan 05, 2008 · Using PCI Express 2.0, motherboard designers can now either offer double the bandwidth in an equivalent size slot or can choose to create smaller layouts without sacrificing performance.
Hence PCI Express will provide much faster video than the older PCI. (See more port types at the bottom of this page). Each 1x lane in PCI Express can transmit in both directions at once. Also please note that in PCI Express bandwidth is not shared the same way as in PCI, so there is less congestion on the bus.
Thunderbolt is run on a PCIe 3.0 x4 bus, but is actually limited to a little over x1 per port. I've showed the the equivalent bandwidth in the chart. I know it's a slow interface in comparison to pcie, but you must also keep in mind that even current high-end gaming is not saturating x16 PCIe.
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For our test, we're looking at PCI-e Gen3 x8 vs. PCI-e Gen3 x16 performance. That means there's a 66.7% difference in bandwidth available between the two, or a 100% increase from x8 to x16.
Does PCIe 1 just not provide enough bandwidth, or as much as the amount the lanes they take from PCIe 2.0 have? Why can't they then use a chip to amplify the <36 lanes to the bandwidth of 36 or more to match other boards? Or even amplify the PCIe 1 x6 lanes to provide the sufficient bandwidth?
theoretical bandwidth of PCI Express by increasing the line rate from 5.0 Gb/s to 8.0 Gb/s and by using a 128B/130B encoding scheme. This more efficient encoding scheme incurs only a 1.5% overhead penalty as opposed to the 20% penalty incurred with 8B/10B. It also incorporates many of the engineering change notices from the
The stats shown below will help you realize the difference in speeds the PCI Express brings to you (thanks to the highly optimized serial connection interface) x1 connection: 250 MB per second in each direction. x2 connection: 500 MB per second in each direction. x4 connection: Up to 1000 MB per second. x8 connection: 2 GB per second.