Table 1. The hardware specification of theworkstastions with GTX680 and GTX 660, respectively.

Device specification (GPU)	GTX680	GTX660
Number of multiprocessors	8	2
Number of cores per multi-processor	192	192
Total amount of global memory	4096 MBytes	512 MBytes
Total number of registers available per block	65536 bytes	65536 bytes
Total amount of shared memory per block	49152 bytes	49152 bytes
Total amount of constant memory	65536 bytes	65536 bytes
Maximum number of threads per block	1024	1024
Warp size	32	32
CPU specification	Intel(R) Xeon(R) CPU W3505 @2.53GHz (RAM 4.00GB)	Intel(R) Core(TM) i5-3470S CPU @2.90GHz (RAM 8.00GB)