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/ Comparison of Sapphire Radeon HD 6670 and GeForce GT 640M Mac
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Comparison of Sapphire Radeon HD 6670 and GeForce GT 640M Mac
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Attribute
GeForce GT 640M Mac
×
Sapphire Radeon HD 6670
×
GPU
Release year (year)
2013
2011
Reference card
-
AMD Radeon HD 6670 800 MHz 1 GB
GPU brand
Nvidia
AMD
GPU name
GK107
Turks XT
Market
Laptop
Desktop
Clock speed (MHz)
745
800
Is dual GPU
-
-
Model
GeForce GT 640M Mac
Sapphire Radeon HD 6670
Memory
Memory (MB)
512
1,024
Memory bandwidth (GB/s)
40
64
Memory bus (bit)
64
128
Memory type
GDDR5
GDDR5
Memory clock speed (MHz)
1,250
1,000
Effective memory clock speed (MHz)
5,000
4,000
Noise and power
1
↑
TDP (W)
32
66
Load power consumption (W)
-
220
Idle power consumption (W)
-
106
Raw performance
Pixel rate (GPixel/s)
5.96
6.4
Render output processors
8
8
Texture mapping units
32
24
Shading units
384
480
Floating-point performance (GFLOPS)
572
768
Compute units
-
6
Texture rate (GTexel/s)
23.84
19.2
Benchmarks
Metro: Last Light
-
30
Particle simulation (mInteraction/s)
69.88
-
T-Rex (Compubench 1.5) (frames/s)
0.56
-
Video composition (frames/s)
11.95
-
Bioshock Infinite
-
33
Face detection (mPixels/s)
6.58
5.23
T-Rex (GFXBench 3.0)
3356.32
3356.86
Manhattan (GFXBench 3.0)
2290.86
2774.23
Bitcoin mining (mHash/s)
12.55
38.55
Sky Diver Factor
-
88.99
Fire Strike Factor
-
10.55
Ocean surface simulation (frames/s)
226.22
-
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