GTX240bandwidthTest

そしてロープロファイルGT240のbandwidthTestも。

 Device 0: GeForce GT 240
 Quick Mode

 Host to Device Bandwidth, 1 Device(s), Paged memory
   Transfer Size (Bytes)	Bandwidth(MB/s)
   33554432			5298.8

 Device to Host Bandwidth, 1 Device(s), Paged memory
   Transfer Size (Bytes)	Bandwidth(MB/s)
   33554432			4010.4

 Device to Device Bandwidth, 1 Device(s)
   Transfer Size (Bytes)	Bandwidth(MB/s)
   33554432			21813.7

device間の速度が22GB/s弱ですね。