GeForce GTX 660 GK104 vs Radeon HD 6990

GeForce GTX 660 GK104
Radeon HD 6990
1152 Shaders
2GB GDDR5
899MHz
2x 1536 Shaders
2x 2GB GDDR5
830MHz
FP32
2.07 TFLOPS
FP32
5.1 TFLOPS
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-
-
-
Form Factor
PCIe Card
2.0-Slots
Form Factor
PCIe Card
2.0-Slots
TDP
130W
TDP
375W
Power Connectors
1x 6-Pin
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-
-
Power Connectors
-
2x 8-Pin
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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
AMD
Chip Designer
NVIDIA
Chip Designer
AMD
Architecture
Kepler
Architecture
TeraScale 3
Family
GeForce 600
Family
Radeon HD 6000
Codename
NVE4
GK104
Variant
GK104-200-KD-A2
Codename
Cayman
RV970
Variant
Antilles XT
Market Segment
Desktop
Market Segment
Desktop
Release Date
8/22/2012
Release Date
3/8/2011
Foundry
TSMC
-
Foundry
TSMC
-
Fabrication Node
28nm
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Fabrication Node
40nm
-
Die Size
294 mm²
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Die Size
2x 389 mm²
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Transistor Count
3.5 Billion
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Transistor Count
2x 2.6 Billion
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Transistor Density
12.04M/mm²
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Transistor Density
6.79M/mm²
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Form
PCIe Card
Form
PCIe Card
Shading Units
1152 Shaders
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Shading Units
2x 1536 Shaders
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Texture Mapping Units
96 TMUs
Texture Mapping Units
2x 96 TMUs
Render Output Units
24 ROPs
Render Output Units
2x 32 ROPs
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-
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-
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Streaming Multiprocessors
6 SMs
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-
-
-
Compute Units
2x 24 CUs
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-
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824MHz Base
899MHz
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830MHz
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FP32
2.07 TFLOPS
FP32
5.1 TFLOPS
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-
-
-
FP64
0.09 TFLOPS
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FP64
1.27 TFLOPS
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Pixel Fillrate
21.576 GPixel/s
Pixel Fillrate
26.56 GPixel/s
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-
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Texture Fillrate
86.304 GTexel/s
Texture Fillrate
79.68 GTexel/s
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-
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L1
48KB/SM Tex
16KB/SM
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-
L1
-
-
8KB/CU
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L2
512KB Shared
L2
512KB Shared
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-
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2GB
GDDR5
-
2x 2GB
GDDR5
-
Bus Width
192Bit
Bus Width
256Bit
Clock
1450MHz
Transfer Rate
5.8GT/s
Bandwidth
139.2GB/s
Clock
1250MHz
Transfer Rate
5GT/s
Bandwidth
160GB/s
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TDP
130W
TDP
375W
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-
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1x DVI-I Dual-Link
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1x DVI-D Dual-Link
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1x DisplayPort 1.2
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1x HDMI 1.4
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1x DVI-I Dual-Link
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4x mini-DisplayPort 1.1
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Max Resolution
4096x2304
Max Resolution
2560x1600
Max Resolution Refresh Rate
60Hz
Max Resolution Refresh Rate
60Hz
Variable Refresh Rate
G-Sync
FreeSync
-
Variable Refresh Rate
-
-
-
Display Stream Compression (DSC)
Not Supported
Display Stream Compression (DSC)
Not Supported
Multi Monitor Support
3
Multi Monitor Support
4
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-
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Model
NVENC 1
No Encoders
-
Codec
-
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AVC (H.264)
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Model
NVDEC 1
Model
UVD 3.1
Codec
MPEG-1
MPEG-2
MPEG-4
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VC-1
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-
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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)
-
-
-
-
-
Direct X
12
Direct 3D
11_0
Direct X
11
Direct 3D
11_0
OpenGL
4.6
OpenCL
3.0
Vulkan
1.2
OpenGL
4.5
OpenCL
1.2
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-
Shader Model
6.5
CUDA
3.0
-
-
PureVideo HD
VP5
VDPAU
Feature Set D
Shader Model
5.0
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-
GFX
5
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1x Fan
-
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1x Fan
Power Connectors
-
-
1x 6-Pin
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Power Connectors
-
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2x 8-Pin
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Slots Required
2.0
PCIe Version
3.0
PCIe Lanes
16
Slots Required
2.0
PCIe Version
2.1
PCIe Lanes
16
Multi GPU Support
Supported
Type
2-way SLI
Multi GPU Support
Supported
Type
2-way CrossFireX
Height
111 mm (4.37 in)
Width
241 mm (9.49 in)
Depth
38 mm (1.5 in)
Height
115 mm (4.53 in)
Width
310 mm (12.2 in)
Depth
40 mm (1.57 in)
Change Results