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