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I've been inside the NCSA building, they have a sweet cluster ... The building in that photo isn't the NCSA cluster thats ranked tho ... its just the DCL
 
Maybe that cluster isn't powerful enough to really be on the radar like Virginia Tech's was. After all, it's only got 640 XServes (1280 processors, assuming 2 processors per XServe). Somehow I missed this cluster too - I guess nobody found it newsworthy.
 
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