![]() But the people wanted more: in 2007, the cross-industry PCI-SIG (“Special Interest Group”) introduced the PCI-E 2.0 standard, which doubled the top speed to 8GB/sec in each direction. The first PCI Express interface was a big hit, quickly supplanting PCI-X in both consumer and server hardware. PCI Express has phenomenal cross-generation capability ![]() With its new architecture, the PCI Express 1.0 interface was able to support bidirectional data transfers at up to 4GB/sec, around four times as fast as the PCI-X hardware that was common at the time. This is because, although a serial connection might not transfer so many bits per cycle as a parallel one, it can often reliably run at much higher frequencies (hard disks were going through a similar transition at around this time, moving from the parallel IDE standard to Serial ATA, or SATA for short).
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