You might find this data interesting: It's the percentage of GPUGRID throughput contributed by each GPU type. This is a more useful metric to us than the actual number of devices attached, since it is corrects for performance.

acemdlong

   #	Capability	: 1.3    1%   GTX280, GTX295, Tesla T10 series
   #	Capability	: 2.0    8%   GTX470,480,570,580 Tesla 2000 series, Quadro non-K
   #	Capability	: 2.1    4%   Other 400,500 series 
   #	Capability	: 3.0   54%   Other 600,700 series, Tesla K10, Quadro K series
   #	Capability	: 3.5   27%   GTX780, 780Ti, Titan, Tesla K20
   #	Capability	: 5.0    7%   GTX 750, 750Ti

acemdshort

   #	Capability	: 1.3    2%
   #	Capability	: 2.0    9%
   #	Capability	: 2.1   11%
   #	Capability	: 3.0   53%
   #	Capability	: 3.5   20%
   #	Capability	: 5.0    6%

"Capability" is the GPU hardware version - the first table maps that to common model names.