Just wanted to note, that although the Roadrunner is based on the IBM PowerXCell, it also uses 6480 AMD opterons... So AMD are in the top 2. Can't be bad.

At place number 29 a cluster of Nodes with nVidia Tesla Accelerators???

TSUBAME Grid Cluster with CompView TSUBASA, from Tokio, Japan

Come on Charlie, come here again and say that Cuda is not working...

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re: "it's clear that Intel is committed to pushing the boundaries of supercomputing"
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really don't like entering the chip/chimp fray that y'all love to push, but did this line from business wire, on the same subject, skip your attention?

"AMD Opteron processors now help drive seven of the Top 10 supercomputer systems in the world"

seems that quality was a bit under-emphasized, in lieu of quantity... at one time, even in the world of 1-processor cores, one i486 was king...
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Rate of Increase: Increasing. O.K. on 9 cellers, theres still some 12 cells planned. 
Told You VeraFlop Has Hold On GoodLife. 8 core w/40 core larrabee, 2011 duncieTime & 2013Be BIGGER Party Than Today w/nalgie'8. 
2015 80 Cores Should be strong, Will Numbers be 10X, probably More. At Least SONY Didn't LIE that Much When Announcing CELL in 2005, From Engineering started in 2001.. It Was Quite Astonishing specs Launch. Guess when label states: PowerXcell 8i, Must mean Ultee' Ability. Too BAD its NOT X64.yet there where plans for ?such in '6 from toshiba, Called CELL Broadband.Here link to previous art in theINQ on X86 Super from Naj:.

http://www.theinquirer.net/en/inquirer/news/2006/10/26/amd-intel-are-come-back-kids-with-x86-vectorisation

STeWie drashek