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To: mas_ who wrote (249071)	3/20/2008 8:58:29 PM
From: b4dt4ste	Read Replies (1) \| Respond to of 275872

45nm 6MB L3 Shanghai on HT3 links will be Nehalem's main competitor not Barcelona. Both are future to-be-released products, but I believe the risk of a lithographic process change (in the former) is much greater than the risk of an architectural change (in the latter). At the very physical (device) level, there are one, maybe two ways to solve a problem. Think about how few physical processes one can use to build a hard drive (using the GMR effect en.wikipedia.org ) or to build a transistor (FET or BJT). In fact, the solutions are so rare yet important that, for example, the inventors/discoverers of the GMR and the transistor were awarded Nobel Prizes. On the other hand, a high-level architectural or algorithm problem has _many_ solutions. One example is encoding/decoding in communication protocols, where one can communicate by changing the frequency (FM, PSK, etc.), or by changing the amplitude (ASK, M-ary ASK, etc.) Sorting algorithms are another example -- there exist good sorting algorithms such as quick sort, heap sort, etc. HT3 is a great link, but a company like Intel can come up with another one (CSI) that is just as great.

To: mas_ who wrote (249071)	3/20/2008 9:19:40 PM
From: graphicsguru	Read Replies (1) \| Respond to of 275872

Is there confirmation that HT3 will finally be a reality with Shanghai?

To: mas_ who wrote (249071)	3/20/2008 9:27:40 PM
From: graphicsguru	Read Replies (1) \| Respond to of 275872

45nm 6MB L3 Shanghai on HT3 links will be Nehalem's main competitor not Barcelona. How much improvement do you expect from Barcelona to Shanghai? How much improvement do you expect from Harpertown to Nehalem? Note that the examples you give where Barcelona is competitive seem to be where either (a) Harpertown is limited by fsb or (b) Harpertown is limited by multithreading locks. Otherwise, Barcelona gets trounced. (a) gets fixed by the integrated memory controller in Nehalem and 3 memory channels and QPI. (b) gets fixed by the memory controller and QPI and the fact that Nehalem becomes a "true quad core" and by the fact that Intel has led us to expect much better lock performance on Nehalem vs. Harpertown. Where does that leave Shanghai's niche?