Radeon HD 8870 vs Radeon HD 6990
Radeon HD 8870
Radeon HD 6990
|
1280 Shaders
2GB GDDR5
1000MHz
|
2x 1536 Shaders
2x 2GB GDDR5
830MHz
|
|
FP32
2.56 TFLOPS
|
FP32
5.1 TFLOPS
|
|
-
-
|
-
-
|
|
Form Factor
PCIe Card
2.0-Slots
|
Form Factor
PCIe Card
2.0-Slots
|
|
TDP
150W
|
TDP
375W
|
|
Power Connectors
2x 6-Pin
-
-
-
|
Power Connectors
-
2x 8-Pin
-
-
|
|
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
AMD
|
Manufacturer
AMD
|
|
Chip Designer
AMD
|
Chip Designer
AMD
|
|
Architecture
GCN 1
|
Architecture
TeraScale 3
|
|
Family
Radeon HD 8000
|
Family
Radeon HD 6000
|
|
Codename
Pitcairn
-
Variant
Pitcairn XT
|
Codename
Cayman
RV970
Variant
Antilles XT
|
|
Market Segment
Desktop
|
Market Segment
Desktop
|
|
Release Date
1/8/2013
|
Release Date
3/8/2011
|
|
Foundry
TSMC
-
|
Foundry
TSMC
-
|
|
Fabrication Node
28nm
-
|
Fabrication Node
40nm
-
|
|
Die Size
212 mm²
-
|
Die Size
2x 389 mm²
-
|
|
Transistor Count
2.8 Billion
-
|
Transistor Count
2x 2.6 Billion
-
|
|
Transistor Density
13.21M/mm²
-
|
Transistor Density
6.79M/mm²
-
|
|
Form
PCIe Card
|
Form
PCIe Card
|
|
Shading Units
1280 Shaders
-
|
Shading Units
2x 1536 Shaders
-
|
|
Texture Mapping Units
80 TMUs
|
Texture Mapping Units
2x 96 TMUs
|
|
Render Output Units
32 ROPs
|
Render Output Units
2x 32 ROPs
|
|
-
-
|
-
-
|
|
-
-
|
-
-
|
|
-
-
|
-
-
|
|
Compute Units
20 CUs
|
Compute Units
2x 24 CUs
|
|
-
-
|
-
-
|
|
-
-
|
-
-
|
|
-
-
-
1000MHz
|
-
-
-
830MHz
|
|
-
-
|
-
-
|
|
-
-
-
|
-
-
-
|
|
-
-
-
|
-
-
-
|
|
-
-
-
|
-
-
-
|
|
FP32
2.56 TFLOPS
|
FP32
5.1 TFLOPS
|
|
-
-
|
-
-
|
|
FP64
0.16 TFLOPS
-
|
FP64
1.27 TFLOPS
-
|
|
-
-
|
-
-
|
|
-
-
-
|
-
-
-
|
|
Pixel Fillrate
32 GPixel/s
|
Pixel Fillrate
26.56 GPixel/s
|
|
-
-
|
-
-
|
|
Texture Fillrate
80 GTexel/s
|
Texture Fillrate
79.68 GTexel/s
|
|
-
-
|
-
-
|
|
L1
-
-
16KB/CU
-
|
L1
-
-
8KB/CU
-
|
|
L2
512KB Shared
|
L2
512KB Shared
|
|
-
-
-
|
-
-
-
|
|
2GB
GDDR5
-
|
2x 2GB
GDDR5
-
|
|
Bus Width
256Bit
|
Bus Width
256Bit
|
|
Clock
1200MHz
Transfer Rate
4.8GT/s
Bandwidth
153.6GB/s
|
Clock
1250MHz
Transfer Rate
5GT/s
Bandwidth
160GB/s
|
|
-
-
-
-
-
-
-
-
-
|
-
-
-
-
-
-
-
-
-
|
|
TDP
150W
|
TDP
375W
|
|
-
-
|
-
-
|
|
-
-
-
-
-
-
-
-
1x DVI-I Dual-Link
-
-
-
-
-
-
2x mini-DisplayPort 1.2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1x HDMI 1.4
-
-
-
-
|
-
-
-
-
-
-
-
-
1x DVI-I Dual-Link
-
-
-
-
-
4x mini-DisplayPort 1.1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
|
|
Max Resolution
4096x2160
|
Max Resolution
2560x1600
|
|
Max Resolution Refresh Rate
60Hz
|
Max Resolution Refresh Rate
60Hz
|
|
Variable Refresh Rate
-
-
-
|
Variable Refresh Rate
-
-
-
|
|
Display Stream Compression (DSC)
Not Supported
|
Display Stream Compression (DSC)
Not Supported
|
|
Multi Monitor Support
3
|
Multi Monitor Support
4
|
|
-
-
|
-
-
|
|
Model
VCE 1.0
|
No Encoders
-
|
|
Codec
-
-
-
-
-
-
-
-
AVC (H.264)
-
-
-
-
-
|
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
|
|
Model
UVD 4.0
|
Model
UVD 3.1
|
|
Codec
MPEG-1
MPEG-2
MPEG-4
-
VC-1
-
-
-
AVC (H.264)
-
-
-
-
-
|
Codec
MPEG-1
MPEG-2
MPEG-4
-
VC-1
-
-
-
AVC (H.264)
-
-
-
-
-
|
|
Direct X
12
Direct 3D
11_1
|
Direct X
11
Direct 3D
11_0
|
|
OpenGL
4.6
OpenCL
2.1
Vulkan
1.2
|
OpenGL
4.5
OpenCL
1.2
-
-
|
|
Shader Model
6.5
-
-
GFX
6
-
-
-
-
|
Shader Model
5.0
-
-
GFX
5
-
-
-
-
|
|
-
-
-
1x Fan
|
-
-
-
1x Fan
|
|
Power Connectors
-
-
2x 6-Pin
-
-
-
-
|
Power Connectors
-
-
-
2x 8-Pin
-
-
-
|
|
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 CrossFireX
|
Multi GPU Support
Supported
Type
2-way CrossFireX
|
|
Height
111 mm (4.37 in)
Width
241 mm (9.49 in)
Depth
37 mm (1.46 in)
|
Height
115 mm (4.53 in)
Width
310 mm (12.2 in)
Depth
40 mm (1.57 in)
|
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