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Old 12-May-2009, 09:54   #1
CarstenS
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Default Larrabee Die-Shot - Analyze this

Today, intel showed the first detailed die-fotograph of Larrabee - some pictures are to be seen at PC Games Hardware.

http://www.pcgameshardware.de/aid,68...fikkarte/News/

Some of the functional units can be distinguished also - pleases take your guesses as to their respecitive number now.

Some photoshopped versions of the pics are soon to follow in the image gallery:

http://www.pcgameshardware.de/aid,68...&show=original

I really hope I#ve not been living under a rock the last couple of months and this is really something new.
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Old 12-May-2009, 10:18   #2
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Awesome, great wake-up surprise.

Looks like 32 cores and 8 texture units.

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Old 12-May-2009, 10:32   #3
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I don't know much about how hw structures look on a die shot but this seemed fairly obvious:
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Old 12-May-2009, 10:51   #4
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Me helps with some photochopin' -- here and here.
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Old 12-May-2009, 10:59   #5
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Quote:
Originally Posted by PeterT View Post
I don't know much about how hw structures look on a die shot but this seemed fairly obvious:
Yup.
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Old 12-May-2009, 11:01   #6
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What looks like the GDDR interface is interesting as there's so much of it. If the die is 30x20 (which I think is a bit small) then that means the DDR interface is about 54mm.

The 256-bit GDDR5 on RV770 is about 36mm. The 512-bit GDDR3 on GT200 is about 75mm.

Larrabee has a 384-bit bus? GDDR3?

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Last edited by Jawed; 12-May-2009 at 19:41. Reason: G80->GT200 - GT200=75 - RV770=36
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Old 12-May-2009, 11:09   #7
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Can anyone spot the PCIe interface pads somewhere?
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Old 12-May-2009, 11:19   #8
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Is Larrabee going to be competitive with 8 texture units ?
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Old 12-May-2009, 11:22   #9
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Quote:
Originally Posted by fellix View Post
Can anyone spot the PCIe interface pads somewhere?
Top-right, vertically? Based on my earlier measurements, 8.1mm. Compared to 8.8mm on RV770 and 7.7mm on G80.

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Old 12-May-2009, 11:28   #10
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Quote:
Originally Posted by V3 View Post
Is Larrabee going to be competitive with 8 texture units ?
Assuming they're quads, that's 32. The clock is the real killer question.

Larrabee should have the best overdraw reduction (other GPUs' early Z rejection is coarse-grained and so conservative).

Dunno, at 1GHz it doesn't seem likely.

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Old 12-May-2009, 11:43   #11
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Quote:
Originally Posted by Jawed View Post
The 256-bit GDDR5 on RV770 is about 33mm. The 512-bit GDDR3 on G80 is about 67mm.

Larrabee has a 384-bit bus? GDDR3?
G80 had a 384 bit bus. Did you mean GT200?
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Old 12-May-2009, 11:46   #12
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Quote:
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G80 had a 384 bit bus. Did you mean GT200?
Whoops, sorry, yeah.

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Old 12-May-2009, 13:14   #13
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I bet this is a mainstream part. They are saving the high end to surprise us. nearer launch.
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Old 12-May-2009, 13:20   #14
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Red - 32 cores
Green - 8 structures (?)
Blue - 4 structures (?)
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Old 12-May-2009, 13:30   #15
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Quote:
Originally Posted by kyetech View Post
I bet this is a mainstream part. They are saving the high end to surprise us. nearer launch.
900mm^2?
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Old 12-May-2009, 14:03   #16
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One more, because photoshop is fun.


If the green blocks are texture units, then what are the blue ones? They are strangely asymmetrical.
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Old 12-May-2009, 14:10   #17
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Blue ones for bus<->memory?

One thing I'm wondering is if Intel has built the DDR interface in two parts, GDDR3, say 256-bit and GDDR5, 128-bit. Rather than trying to make the interfacing multifunctional.

Or, maybe it's 256-bit GDDRx + 128-bit "communicate with another Larrabee"?

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Old 12-May-2009, 14:33   #18
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The x86 cores are very Atom-like in shape. The L2 array can definitely be spotted in the one end of the tile, and in the opposite end there is also some uniform array of structures (registers ?).
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Old 12-May-2009, 14:51   #19
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The cores are more svelt than my guesstimated lower bound of ~18mm2.
It's what, 15 or so? I unfortunately don't have time to do more than glance.

At 32 cores, Larrabee would have two short-linked rings of 16.
Other statements said that the bus was routed over the L2.
The odd part is that the caches don't really point to a very even distribution.

The four blue sections would fit with the desire to space memory controller ring stops evenly, and they could also be used to serve as the connection points that connect the two rings.
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Old 12-May-2009, 14:56   #20
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12mm˛?
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Old 12-May-2009, 14:56   #21
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Now, I wonder what will heat up this thing more -- FurMark or some weird port of the IBT (Linpak) test?
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Old 12-May-2009, 15:02   #22
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Silverthorne die (Atom) in a LRB disguise -- minus half the L2 and the AGTL+ interface.
Imagine the SIMD unit for yourself!
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Old 12-May-2009, 15:04   #23
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Quote:
Originally Posted by kyetech View Post
I bet this is a mainstream part. They are saving the high end to surprise us. nearer launch.
Can anyone guess a die size on this one?
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Old 12-May-2009, 15:07   #24
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Quote:
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Can anyone guess a die size on this one?

32->48 cores?

http://forum.beyond3d.com/showpost.p...2&postcount=15
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Old 12-May-2009, 15:15   #25
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Quote:
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I don't believe this is 900mm2.
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