Larrabee delayed until 2011 summer?

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alyarb

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Jan 25, 2009
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that's ok. i didn't want to see a demo with less than 40 cores, and given the area figure they quoted, it looks like they are shooting for 48. 32nm it is, then. i just want to see how it runs something as uniquely "unoptimized" as crysis or something like that. an architectural deviant like larrabee may have something to show.
 
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alyarb

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Jan 25, 2009
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although...

Originally posted by: anand
Remember the design experiment? Intel was able to fit a 10-core Larrabee into the space of a Core 2 Duo die. Given the specs of the Core 2 Duo Intel used (4MB L2 cache), it appears to be a 65nm Conroe/Merom based Core 2 Duo - with a 143 mm^2 die size.

At 143 mm^2, Intel could fit 10 Larrabee-like cores so let's double that. Now we're at 286mm^2 (still smaller than GT200 and about the size of AMD's RV770) and 20-cores. Double that once more and we've got 40-cores and have a 572mm^2 die, virtually the same size as NVIDIA's GT200 but on a 65nm process.

The move to 45nm could scale as well as 50%, but chances are we'll see something closer to 60 - 70% of the die size simply by moving to 45nm (which is the node that Larrabee will be built on). Our 40-core Larrabee is now at ~370mm^2 on 45nm. If Intel wanted to push for a NVIDIA-like die size we could easily see a 64-core Larrabee at launch for the high end, with 24 or 32-core versions aiming at the mainstream. Update: One thing we did not consider here is power limitations. So while Intel may be able to produce a 64-core Larrabee with a GT200-like die-size, such a chip may exceed physical power limitations. It's far more likely that we'll see something in the 16 - 32 core range at 45nm due to power constraints rather than die size constraints.
Click to expand...

though that was written a year ago, it contrasts with the area data that is said to be encapsulated in a tomshardware rumor.
 
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alyarb

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Jan 25, 2009
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yes, but they've had test silicon for years that they need in order to build the software renderer. they claim even in august 2008 to have a 40-core at 370 sq mm.
 
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