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But what's the latency? I'm inclined to mention that a truck full of tapes hurtling down a freeway has a 'high bandwidth'.

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I tried searching the spec itself (http://hybridmemorycube.org/files/SiteDownloads/HMC_Specific...) but it doesn't seem to contain any specifications about the latency.

Lots of talk about latency-minimization though, but it seems this is basically a packet-oriented interface (with CRC on packets, retries and stuff) so I guess latency will be larger than with today's DDR interfaces.

Perhaps computer systems will have both DDR memory and HMC, letting the OS and/or applications decide how to distribute access for maximum performance.

I haven't read the 1.0 spec yet but if the marketing in their FAQ is to be believed, they claim "will provide a substantial system latency reduction"

http://hybridmemorycube.org/faq.html

The 1.0 spec is at:

hybridmemorycube.org/files/SiteDownloads/HMC_Specification_1_0.pdf

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