|
guanqq_64 发表于 2012-10-19 21:23
实际上 PCIE 3.0 8X带宽稍逊于 2.0 16X 解码效率不知道 不过这两个应该半斤八两 没啥区别
你这个是很早的测试了吧,pci-e 3.0下载驱动完善了应该不一样了。
至少,680这个级别的,在pci-e 8x和16x 3.0上是没差别的。
编码效率见wiki
PCIe 3.0 removes the requirement 2.0 has for 8b/10b encoding, and instead uses a technique called "scrambling" that applies a known binary polynomial to a data stream in a feedback topology. Because the scrambling polynomial is known, the data can be recovered by running it through a feedback topology using the inverse polynomial.[25] and also uses a 128b/130b encoding scheme, reducing the overhead to approximately 1.5% ((130-128)/130), as opposed to the 20% overhead of 8b/10b encoding used by PCIe 2.0. PCIe 3.0's 8 GT/s bit rate effectively delivers double PCIe 2.0 bandwidth. PCI-SIG expects the PCIe 3.0 specifications to undergo rigorous technical vetting and validation before being released to the industry. This process, which was followed in the development of prior generations of the PCIe Base and various form factor specifications, includes the corroboration of the final electrical parameters with data derived from test silicon and other simulations conducted by multiple members of the PCI-SIG.
|
|