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PCI Express 3.0 upgraded the encoding scheme to 128b/130b from the previous 8b/10b encoding, reducing the bandwidth overhead from 20% of PCI Express 2.0 to approximately 1.54% (= 2/130). PCI Express 3.0's 8 GT/s bit rate effectively delivers 985 MB/s per lane, nearly doubling the lane bandwidth relative to PCI Express 2.0. [57]
For example, a single link PCIe 3.0 interface has an 8 Gbit/s transfer rate, yet its usable bandwidth is only about 7.88 Gbit/s. z Uses 8b/10b encoding , meaning that 20% of each transfer is used by the interface instead of carrying data from between the hardware components at each end of the interface.
PCIe 1.0 x1 offers 250 MB/s in each direction (lane), and up to 16 lanes (x16) are currently supported each direction, in full-duplex, giving for PCIe 1.0 a maximum of 4 GB/s bandwidth in each direction. PCI-X 2.0 offers (at its maximum 64-bit 533-MHz variant) a maximum bandwidth of 4,266 MB/s (≈4.3 GB/s), although only in half-duplex.
PCIe 3.0 x16 384:32:16 725 725 1800 5.8 23 up to 2048 14.4 – 64.0 DDR3 GDDR5 128 1.1 552.2 33 March 6, 2014 GK208 PCIe 2.0 x8 384:16:8 5.8 11.5 64 GeForce GT 735M [15] April 1, 2013 PCIe 2.0 x8 384:32:8 889 889 2000 4.6 9.2 up to 2048 16.0 DDR3 64 1.2 441.6 33 GeForce GT 740M [16] April 1, 2013 GK107 PCIe 3.0 x16 384:32:16 810-1033 810-1033
PCIe 3.0 x8 384:24:8 952 1020 2000 Unknown Unknown 2048 Unknown DDR3 GDDR5 Unknown Unknown Unknown Unknown Unknown Unknown GeForce 940M [65] [66] [67] March 13, 2015 GM107 1870 148 PCIe 3.0 x16 640:40:16 1029 1100 2002 16.5 41.2 2048 16 - 80.2 GDDR5 DDR3 128 1.2 1.1 1317 41.1 75 No GM108 [i] Unknown Unknown PCIe 3.0 x8 384 ...
Bandwidth (GB/s) DRAM type Bus width Vulkan [d] Direct3D OpenGL OpenCL Single precision Double precision; GeForce 605 [e] April 3, 2012 GF119 TSMC 40 nm: 292 79 PCIe 2.0 x16 1 48:8:4 523 — — 1046 898 (1796) 2.09 4.2 512 1024 14.4 DDR3 64 — 12 4.6 1.2 100.4 Unknown 25 OEM GeForce GT 610 [f] May 15, 2012 GF119-300-A1 PCIe 2.0 x16, PCIe x1 ...
It allows up to 4 lanes of PCI Express 3.0 (32.4 Gbit/s) for general-purpose data transfer, and 4 lanes of DisplayPort 1.4 HBR3 (32.40 Gbit/s before 8/10 encoding removal, and 25.92 Gbit/s after) for video, [79] but the maximum combined data rate cannot exceed 40 Gbit/s; video data will be using all needed speed, limiting PCIe data. DP 1.2 ...
The ExpressCard has a maximum throughput of 2.5 Gbit/s through PCI Express and 480 Mbit/s through USB 2.0 dedicated for each slot, while all CardBus and PCI devices connected to a computer usually share a total 1.06 Gbit/s bandwidth. The ExpressCard standard specifies voltages of either 1.5 V or 3.3 V; CardBus slots can use 3.3 V or 5.0 V.