HyperTransport 3.0 announced


— 2:37 PM on April 24, 2006

The HyperTransport Consortium has announced version 3.0 of the HyperTransport interconnect specification. The new spec bumps clock speeds up to 2.6GHz, yielding a maximum 20.8GB/s of full-duplex bandwidth with a 16-bit link. In contrast, the HyperTransport 2.0 interconnect used by AMD's K8 processors only offers up to 8GB/s via a 1GHz, 16-bit link. Along with its increased speed, HT 3.0 brings four major additions to the spec:

... an optional "AC" mode, which allows a HyperTransport connection to be extended across a greater physical distance; the unganging mode, which allows the 32-bit link to be split up into two-16-bit connections, and power management capabilities, by which designers can adjust the link speeds and power used to trade off between the available power and performance. Finally, the technology now supports hot-plugged components, which can be replaced without powering down a key server.
AMD is expected to transition to HyperTransport 3.0 by next year, likely with its new 65nm K8- and K8L-based Opterons. The chips are expected to feature "at least four cores" and scale up to 32 sockets, so it looks like the extra bandwidth provided by HT 3.0 will come in handy.
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