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Xtreme X.I.P.
#1 is already known. AMD (in a blog, if I recall) has stated that the interconnect in their MCM product uses an even faster version of the normal HT link used in MP systems. Yes, Istanbul has a snoop filter. What isn't known is how it will apply. Given the extra apparent bandwidth, MC may conceivably not use any filter between the two modules. It would be completely unnecessary for two CPUs in one package just as it is for current 2P systems. (CPU0 goes, "Hey, I don't have that memory address. Since there are only two of us, it must be at CPU1.") I would imagine how that works inside the package will be dictated by how they've rigged up the newly-combined (quad-channel DDR3) memory controller. If each chip in the MCM is set up as one NUMA node, I suspect we'll see the potential for the snoop filter to exist between both dies on the same package when there are 2+ CPUs installed. It makes the most sense though, I think, that they are treated as one. Otherwise it isn't so much "quad-channel" as they've been marketing it as it would be "dual, dual-channel". There's a real difference there.
Last edited by Particle; 02-03-2010 at 06:46 AM.
Particle's First Rule of Online Technical Discussion:
As a thread about any computer related subject has its length approach infinity, the likelihood and inevitability of a poorly constructed AMD vs. Intel fight also exponentially increases.
Rule 1A:
Likewise, the frequency of a car pseudoanalogy to explain a technical concept increases with thread length. This will make many people chuckle, as computer people are rarely knowledgeable about vehicular mechanics.
Rule 2:
When confronted with a post that is contrary to what a poster likes, believes, or most often wants to be correct, the poster will pick out only minor details that are largely irrelevant in an attempt to shut out the conflicting idea. The core of the post will be left alone since it isn't easy to contradict what the person is actually saying.
Rule 2A:
When a poster cannot properly refute a post they do not like (as described above), the poster will most likely invent fictitious counter-points and/or begin to attack the other's credibility in feeble ways that are dramatic but irrelevant. Do not underestimate this tactic, as in the online world this will sway many observers. Do not forget: Correctness is decided only by what is said last, the most loudly, or with greatest repetition.
Rule 3:
When it comes to computer news, 70% of Internet rumors are outright fabricated, 20% are inaccurate enough to simply be discarded, and about 10% are based in reality. Grains of salt--become familiar with them.
Remember: When debating online, everyone else is ALWAYS wrong if they do not agree with you!
Random Tip o' the Whatever
You just can't win. If your product offers feature A instead of B, people will moan how A is stupid and it didn't offer B. If your product offers B instead of A, they'll likewise complain and rant about how anyone's retarded cousin could figure out A is what the market wants.
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