GT240のbandwidthTest

$ bandwidthTest 
Running on......
      device 0:GeForce GT 240
Quick Mode
Host to Device Bandwidth for Pageable memory.
Transfer Size (Bytes)	Bandwidth(MB/s)
 33554432		5256.1

Quick Mode
Device to Host Bandwidth for Pageable memory.
Transfer Size (Bytes)	Bandwidth(MB/s)
 33554432		4374.3

Quick Mode
Device to Device Bandwidth.
Transfer Size (Bytes)	Bandwidth(MB/s)
 33554432		25085.9

&&&& Test PASSED

GTX260でのbandwidthTestは以下。

Running on......
     device 0:GeForce GTX 260
Quick Mode
Host to Device Bandwidth for Pageable memory.
Transfer Size (Bytes)	Bandwidth(MB/s)
33554432		5265.3

Quick Mode
Device to Host Bandwidth for Pageable memory.
Transfer Size (Bytes)	Bandwidth(MB/s)
33554432		4414.3

Quick Mode
Device to Device Bandwidth.
Transfer Size (Bytes)	Bandwidth(MB/s)
33554432		98374.9

&&&& Test PASSED

Device間の速度が、GT240では25GB/sなのに対して、GTX260では98GB/s。約4分の1ですな（ちなみに、とある環境のTesla C1060のそれは74GB/s弱でした）。