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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.
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]
Bandwidth (GB/s) Bus type Bus width Single precision Double precision Idle Max. Direct3D OpenGL OpenCL; Radeon HD 5450 Feb 4, 2010: Cedar 40 292 59 PCIe 2.1 x16 PCI PCIe 2.1 x1 650 650 650 400 800 800 80:8:4 2.6 5.2 512 1024 2048 6.4 12.8 DDR2 DDR3 64 104 — 6.4 19.1 No 11.3 (11 0) 4.5 1.2 ~50 Radeon HD 5550 Feb 9, 2010: Redwood LE 627 104 ...
Memory bandwidth DVMT Hardware acceleration Direct3D OpenGL ... PCIe 5.0 x16 Data Center GPU Max 1350 ... 13.5 MB 2500 2750: 180 198: 360 396: 10 ...
The ISQ symbols for the bit and byte are bit and B, respectively.In the context of data-rate units, one byte consists of 8 bits, and is synonymous with the unit octet.The abbreviation bps is often used to mean bit/s, so that when a 1 Mbps connection is advertised, it usually means that the maximum achievable bandwidth is 1 Mbit/s (one million bits per second), which is 0.125 MB/s (megabyte per ...
The PCI-X standard was developed jointly by IBM, HP, and Compaq and submitted for approval in 1998. It was an effort to codify proprietary server extensions to the PCI local bus to address several shortcomings in PCI, and increase performance of high bandwidth devices, such as Gigabit Ethernet, Fibre Channel, and Ultra3 SCSI cards, and allow processors to be interconnected in clusters.