GeForce GTX 645 vs GeForce GT 640 GK208

GeForce GTX 645
GeForce GT 640 GK208
576 Shaders
1GB GDDR5
889MHz
384 Shaders
1GB GDDR5
1046MHz
FP32
1.02 TFLOPS
FP32
0.8 TFLOPS
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-
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Form Factor
PCIe Card
1.0-Slots
Form Factor
PCIe Card
1.5-Slots
TDP
64W
TDP
49W
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GB5 OpenCL - N/A
0%
GB5 OpenCL - N/A
0%
GB5 CUDA - N/A
0%
GB5 CUDA - N/A
0%
GB5 Metal - N/A
0%
GB5 Metal - N/A
0%
GB5 Vulkan - N/A
0%
GB5 Vulkan - N/A
0%
OCT 2020.1 - N/A
0%
OCT 2020.1 - N/A
0%
OCT Metal - N/A
0%
OCT Metal - N/A
0%
Manufacturer
NVIDIA
Manufacturer
NVIDIA
Chip Designer
NVIDIA
Chip Designer
NVIDIA
Architecture
Kepler
Architecture
Kepler 2
Family
GeForce 600
Family
GeForce 600
Codename
NVE6
GK106
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-
Codename
NV108
GK208
Variant
GK208-400-A1
Market Segment
Desktop
Market Segment
Desktop
Release Date
4/22/2013
Release Date
5/29/2013
Foundry
TSMC
-
Foundry
TSMC
-
Fabrication Node
28nm
-
Fabrication Node
28nm
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Die Size
221 mm²
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Die Size
79 mm²
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Transistor Count
2.5 Billion
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Transistor Count
1 Billion
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Transistor Density
11.49M/mm²
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Transistor Density
12.91M/mm²
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Form
PCIe Card
Form
PCIe Card
Shading Units
576 Shaders
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Shading Units
384 Shaders
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Texture Mapping Units
48 TMUs
Texture Mapping Units
16 TMUs
Render Output Units
16 ROPs
Render Output Units
8 ROPs
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Streaming Multiprocessors
3 SMs
Streaming Multiprocessors
2 SMs
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824MHz Base
889MHz
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1046MHz
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FP32
1.02 TFLOPS
FP32
0.8 TFLOPS
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-
FP64
0.04 TFLOPS
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FP64
0.03 TFLOPS
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Pixel Fillrate
14.216 GPixel/s
Pixel Fillrate
8.368 GPixel/s
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Texture Fillrate
42.648 GTexel/s
Texture Fillrate
16.736 GTexel/s
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L1
48KB/SM Tex
16KB/SM
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L1
48KB/SM Tex
16KB/SM
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-
L2
512KB Shared
L2
256KB Shared
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-
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1GB
GDDR5
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1GB
GDDR5
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Bus Width
128Bit
Bus Width
64Bit
Clock
1000MHz
Transfer Rate
4GT/s
Bandwidth
64GB/s
Clock
1252MHz
Transfer Rate
5GT/s
Bandwidth
40.1GB/s
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TDP
64W
TDP
49W
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1x DVI-I Dual-Link
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1x DisplayPort 1.2
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1x HDMI 1.4
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1x VGA
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1x DVI-I Dual-Link
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1x HDMI 1.4
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-
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Max Resolution
4096x2304
Max Resolution
4096x2304
Max Resolution Refresh Rate
30Hz
Max Resolution Refresh Rate
30Hz
Variable Refresh Rate
G-Sync
FreeSync
-
Variable Refresh Rate
G-Sync
FreeSync
-
Display Stream Compression (DSC)
Not Supported
Display Stream Compression (DSC)
Not Supported
Multi Monitor Support
2
Multi Monitor Support
2
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Model
NVENC 1
No Encoders
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Codec
-
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AVC (H.264)
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Model
NVDEC 1
Model
NVDEC 1
Codec
MPEG-1
MPEG-2
MPEG-4
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VC-1
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AVC (H.264)
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Codec
MPEG-1
MPEG-2
MPEG-4
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VC-1
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AVC (H.264)
-
-
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Direct X
12
Direct 3D
11_0
Direct X
12
Direct 3D
11_0
OpenGL
4.6
OpenCL
3.0
Vulkan
1.2
OpenGL
4.6
OpenCL
3.0
Vulkan
1.2
Shader Model
6.5
CUDA
3.0
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PureVideo HD
VP5
VDPAU
Feature Set D
Shader Model
6.5
CUDA
3.5
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PureVideo HD
VP5
VDPAU
Feature Set D
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1x Fan
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1x Fan
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Slots Required
1.0
PCIe Version
3.0
PCIe Lanes
16
Slots Required
1.5
PCIe Version
2.0
PCIe Lanes
8
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Height
111 mm (4.37 in)
Width
168 mm (6.61 in)
Depth
20 mm (0.79 in)
Height
111 mm (4.37 in)
Width
145 mm (5.71 in)
Depth
30 mm (1.18 in)
Change Results