Radeon HD 4770 vs Radeon HD 4870 X2

Radeon HD 4770
Radeon HD 4870 X2
640 Shaders
512MB GDDR5
750MHz
2x 800 Shaders
2x 1GB GDDR5
750MHz
FP32
0.96 TFLOPS
FP32
2.4 TFLOPS
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Form Factor
PCIe Card
1.0-Slots
Form Factor
PCIe Card
2.0-Slots
TDP
80W
TDP
286W
Power Connectors
1x 6-Pin
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Power Connectors
1x 6-Pin
1x 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
ATI
Manufacturer
ATI
Chip Designer
ATI
Chip Designer
ATI
Architecture
TeraScale 1
Architecture
TeraScale 1
Family
Radeon HD 4000
Family
Radeon HD 4000
Codename
Walden
RV740
Variant
RV740
Codename
Wekiva
RV770
Variant
RV770 XT
Market Segment
Desktop
Market Segment
Desktop
Release Date
4/28/2009
Release Date
8/12/2008
Foundry
TSMC
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Foundry
TSMC
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Fabrication Node
40nm
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Fabrication Node
55nm
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Die Size
137 mm²
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Die Size
2x 256 mm²
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Transistor Count
826 Million
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Transistor Count
2x 956 Million
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Transistor Density
6.03M/mm²
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Transistor Density
3.73M/mm²
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Form
PCIe Card
Form
PCIe Card
Shading Units
640 Shaders
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Shading Units
2x 800 Shaders
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Texture Mapping Units
32 TMUs
Texture Mapping Units
2x 40 TMUs
Render Output Units
16 ROPs
Render Output Units
2x 16 ROPs
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Compute Units
8 CUs
Compute Units
2x 10 CUs
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750MHz
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750MHz
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FP32
0.96 TFLOPS
FP32
2.4 TFLOPS
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FP64
0.19 TFLOPS
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FP64
0.48 TFLOPS
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Pixel Fillrate
12 GPixel/s
Pixel Fillrate
12 GPixel/s
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Texture Fillrate
24 GTexel/s
Texture Fillrate
30 GTexel/s
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L1
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16KB/CU
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L1
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16KB/CU
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L2
128KB Shared
L2
256KB Shared
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512MB
GDDR5
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2x 1GB
GDDR5
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Bus Width
128Bit
Bus Width
256Bit
Clock
800MHz
Transfer Rate
3.2GT/s
Bandwidth
51.2GB/s
Clock
900MHz
Transfer Rate
3.6GT/s
Bandwidth
115.2GB/s
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TDP
80W
TDP
286W
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1x S-Video
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2x DVI-I Dual-Link
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1x S-Video
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2x DVI-I Dual-Link
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Max Resolution
2560x1600
Max Resolution
2560x1600
Max Resolution Refresh Rate
60Hz
Max Resolution Refresh Rate
60Hz
Variable Refresh Rate
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Variable Refresh Rate
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Display Stream Compression (DSC)
Not Supported
Display Stream Compression (DSC)
Not Supported
Multi Monitor Support
2
Multi Monitor Support
2
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No Encoders
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No Encoders
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Model
UVD 2.2
Model
UVD 2.0
Codec
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VC-1
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AVC (H.264)
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Codec
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VC-1
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AVC (H.264)
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Direct X
10
Direct 3D
10_1
Direct X
10
Direct 3D
10_1
OpenGL
3.3
OpenCL
1.1
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OpenGL
3.3
OpenCL
1.1
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Shader Model
4.1
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GFX
3
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Shader Model
4.1
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GFX
3
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1x Fan
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1x Fan
Power Connectors
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1x 6-Pin
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Power Connectors
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1x 6-Pin
1x 8-Pin
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Slots Required
1.0
PCIe Version
2.0
PCIe Lanes
16
Slots Required
2.0
PCIe Version
2.0
PCIe Lanes
16
Multi GPU Support
Supported
Type
2-way CrossFireX
Multi GPU Support
Supported
Type
2-way CrossFireX
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Change Results