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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 223.53+1.1%Jan 14 3:59 PM EST
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To: muzosi who wrote (255204)8/5/2008 1:58:14 AM
From: fastpathguruRead Replies (3) of 275872
 
actually we already know that graphics acceleration is a very good application because existing gpus have several hundred execution units already and they're being kept full by existing games over existing interfaces so it's safe to assume larabee can do the same.

I don't think it's safe to assume that. Witness 4870 vs. 3870, in graphics applications; with the same core clock speed but 2.5x (800 vs. 320) cores with a generational gap and 2x (115GB/s vs 57GB/s) memory bandwidth, it achieves 1.5-1.8x performance.

GPUs, obviously optimized for graphics, could not achieve anywhere near linear scaling with nothing but more cores, without the infrastructure supporting the cores getting complementary improvements.

I simply have a hard time believing that slide at all, if it's purporting to display linear scaling in anything worth caring about.

I mean COME ON... Far Cry gets perfect linear scaling from 8 to 32 cores? Far Cry?!?! Do they even have* a graphics pipeline that can render Far Cry? With any fidelity?

There are only a few possible explanations for the graph:
A) The chart is not representing anything meaningful performance-wise,
B) The chart is bogus,
C) The non-core portions of the chip are over-engineered by an order of magnitude,
D) Intel has come up with magic crystals that allow them to conquer Amdahls Law.

fpg

*We all know how much the Intel folks love to pound AMD for publishing expected performance based on simulations...
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