How to Calculate FLOPS of GPU

How to Calculate FLOPS (floating point operations per second) of GPU

or How to Calculate GigaFlops of GPU

For this You should know

1. Clock Speed of the GPU
2. No of mul-add (ALU that can perform both mul and add in one clock second) units, nof of mul units
3. No of SIMD units
4. No of Cores

    Clock speed tells about how many instruction can be generated in one second

     In one clock tick one mul-add unit can perform one multiplication + one add so 2 (two) floating point operations per clock
    In one clock tick one mul unit can perform one multiplication so 1 floating point operation per clock tick
  
    Each SIMD unit will have these units and Each Core will have SIMD units so

    Floating point operations per second= no of cores * no of SIMD units * ((no of mul-add units*2) + ( no of mul units)) * clock speed in Hertz

if the clock speed is in GHz , result is Giga flops per second
Example :

	AMD FireStream 9250	NVIDIA Quadro FX 4800	NVIDIA Quadro 6000	ATI FirePro V9800	Tesla C2070
No of Cores	10	24	56	20	56
SIMDs per Core	16	8	8	16	8
mul_add units (2 flops)	5	1	1	5	1
mul units (1 flop)	0	1	0	0	0
clock Speed (GH)	0.75	1.204	1.15	0.85	1.15
Max GFLOPS (Cores*SIMDs*(mul-add*2+mul*1)*clock speed)	1200	693.504	1030.4	2720	1030
Global Memory (GB)	1	1.5	6	4	6
LOCAL Memory	NIL	16 KB	16KB	16KB	16KB
Bandwidth			144 GB/s		144 GB/S
power consumption			225 W	225W	238W

Above table also shows GPU Comparisions



Same formula applies for CPU also but SIMDs may not be there