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Other Graphics Cards and 3D Technologies Discussion forum for any graphics hardware not provided by AMD/ATI. Also place to discuss 3D technologies such as 3D Stereo, PhysX and other interesting developments/rumours in the 3D industry.

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Old May 7, 2009, 02:20 AM   #1
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windycityguy
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Default 3 New Whitepapers from Intel on Larrabee

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Old May 7, 2009, 06:00 AM   #2
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Thanks!
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Old May 8, 2009, 02:05 PM   #3
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oh shiny
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Old May 13, 2009, 08:57 PM   #4
Qb2k5
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Default First Larrabee die shot.


http://www.pcgameshardware.com/aid,6...by-Intel/News/

One guy from B3D was nice enough to map the cores with Photoshop.



Red - 32 cores
Green - 8 structures (?)
Blue - 4 structures (?)

Food for thought:
32 cores..vs GTX28x 240 cores
8 Texture units vs GT28x 80 Texture units...

Last edited by Qb2k5 : May 13, 2009 at 09:34 PM.
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Old May 14, 2009, 08:25 PM   #5
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Originally Posted by Qb2k5 View Post
Nvidia's marketing strikes again! GTX280 has 30 8-wide "cores", Larrabee has 32 16-wide "cores" So it's actually 240 vs 512.
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Old May 14, 2009, 08:29 PM   #6
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GTX 280 has been released for a year and is a 2-4 year old design. The Larrabee isn't released and not scheduled until sometime next year.
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Old May 14, 2009, 08:30 PM   #7
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Originally Posted by trinibwoy View Post
Nvidia's marketing strikes again!
I was going by what the guys at B3D was saying.
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Old May 14, 2009, 08:31 PM   #8
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Quote:
Originally Posted by trinibwoy View Post
Nvidia's marketing strikes again! GTX280 has 30 8-wide "cores", Larrabee has 32 16-wide "cores" So it's actually 240 vs 512.
Is that right? Here's hoping that it actually lives up to the hype for once.
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Old May 14, 2009, 09:37 PM   #9
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More Larrabee news: Full TechReport Damage Report

Quote:
Happily, with no more information than that, we can tentatively pretend to start handicapping this chip's possible graphics power. We know Larrabee cores have 16-wide vector processing units, so 32 of them would yield a total of 512 operations per clock. The RV770/790 has 160 five-wide execution units for 800 ops per clock, and the GT200/b has 240 scalar units, for 240 ops/clock. Of course, that's not the whole story. The GT200/b is designed to run at higher clock frequencies than the RV770/790, and its scalar execution units should be more fully utilized, to name two of several considerations. Also, Larrabee cores are dual-issue capable, with a separate scalar execution unit.
If I'm right about the identity of the texture and memory blocks, and if they are done in the usual way for today's GPUs (quite an assumption, I admit), then this chip should have eight texture units capable of filtering four texels per clock, for a total of 32 tpc, along with four 64-bit memory interfaces. I'd assume we're looking at GDDR5 memory, which would mean four transfers per clock over that 256-bit (aggregate) memory interface.
All of which brings us closer to some additional guessing about likely clock speeds. Today's GPUs range from around 700 to 1500MHz, if you count GT200/b shader clocks. G92 shader clocks range up to nearly 1.9GHz. But Larrabee is expected to be produced on Intel's 45nm fab process, which offers higher switching speeds than the usual 55/65nm TSMC process used by Nvidia and AMD. Penryn and Nehalem chips have made it to ~3.4GHz on Intel's 45nm tech. At the other end of the spectrum, the low-power Atom tends to run comfortably at 1.6GHz. I'd expect Larrabee to fall somewhere in between.
Where, exactly? Tough to say. I've got to think we're looking at somewhere between 1.5 and 2.5GHz. Assuming we were somehow magically right about everything, and counting on a MADD instruction to enable a peak of two FLOPS per clock, that would mean the Larrabee chip in this die shot could line up something like this:





In the numbers above, I'm betting that GDDR5 memory will make it up to 1GHz by the time this GPU is released, and I'm counting on Intel's texture filtering logic to work at half the rate on FP16 texture formats. We can't determine the pixel fill rate because Larrabee will use its x86 cores to do rasterization in software rather than dedicated hardware. I'm just working my way through Michael Abrash's write-up of the default Larrabee rasterizer now, but I don't think we can assume a certain rate per clock given how it all works.
Obviously, clock speed makes a tremendous difference in this whole picture. Nonetheless, we're looking at a potentially rather powerful graphics chip, at least in terms of raw, peak arithmetic. If the tile-based approach to rasterization is as fast and efficient as purported, then the relatively pedestrian memory bandwidth quoted above might not be as much of an obstacle as it would be for a conventional GPU, either.
That's my first crack at this, anyhow. Would be cool if I turned out to be more right than wrong, but it's all guesswork for now. At the very least, one can begin to see the potential for Larrabee to compete with today's best DX10 GPUs. Whether or not it will be effective enough to contend with tomorrow's DX11 parts, well, that's another story.
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Old May 14, 2009, 09:53 PM   #10
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Wow... Intel might become a contender and really shake things up eh?
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Old May 15, 2009, 08:41 AM   #11
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Quote:
Originally Posted by Qb2k5 View Post
I was going by what the guys at B3D was saying.
The guys at B3D know that GT200 only has 30 cores (RV770 has 10)

This is a moot point though since we have no clue what GT300 and RV870 look like. They could blow LRB out of the water.
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Old May 15, 2009, 11:22 AM   #12
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Its all very bitboys till we have the silicon in our gubby little hands and can test it.
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Old May 15, 2009, 11:50 AM   #13
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Quote:
Originally Posted by pahncrd View Post
Wow... Intel might become a contender and really shake things up eh?
We'll see....

I have a feeling some people are going to be let down because they got their hopes up a bit too much for this thing.
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Old May 16, 2009, 06:03 PM   #14
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I hope it becomes another 9700pro where it blows everything out of the water.
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Old May 16, 2009, 06:16 PM   #15
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Quote:
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I hope it becomes another 9700pro where it blows everything out of the water.
That would be even better if transmeta or someone like that was making it.
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