Comparison of Radeon HD 5770 Engineering Sample and GeForce GT 640M Mac

Attribute	Radeon HD 5770 Engineering Sample ×	GeForce GT 640M Mac ×
GPU
Release year (year)	2009	2013
Reference card	ATi Radeon HD 5770 850 MHz 1 GB	-
GPU brand	ATI	Nvidia
GPU name	Juniper	GK107
Market	Desktop	Laptop
Clock speed (MHz)	850	745
Is dual GPU	-	-
Model	Radeon HD 5770 Engineering Sample	GeForce GT 640M Mac
Memory
Memory (MB)	1,024	512
Memory bandwidth (GB/s)	76.8	40
Memory bus (bit)	128	64
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,200	1,250
Effective memory clock speed (MHz)	4,800	5,000
Noise and power
TDP (W)	108	32
Load power consumption (W)	258	-
Idle power consumption (W)	113	-
Load noise level (dB)	41	-
Idle noise level (dB)	40.4	-
Raw performance
Pixel rate (GPixel/s)	13.6	5.96
Render output processors	16	8
Texture mapping units	40	32
Shading units	800	384
Floating-point performance (GFLOPS)	1,360	572
Compute units	10	-
Texture rate (GTexel/s)	34	23.84
Benchmarks
Particle simulation (mInteraction/s)	-	69.88
T-Rex (Compubench 1.5) (frames/s)	-	0.56
Video composition (frames/s)	-	11.95
Crysis 3	40	-
Face detection (mPixels/s)	9.96	6.58
T-Rex (GFXBench 3.0)	3353.2	3356.32
Manhattan (GFXBench 3.0)	3507.76	2290.86
Bitcoin mining (mHash/s)	122.81	12.55
Sky Diver Factor	140.24	-
Fire Strike Factor	19.74	-
Ocean surface simulation (frames/s)	461.22	226.22