Radeon HD 4855 and Radeon HD 4850 X2 - video card comparison
Radeon HD 4855
Radeon HD 4850 X2
Architecture
TeraScale (2005−2013)
TeraScale (2005−2013)
GPU code name
RV770
R700
Market segment
Desktop
Desktop
Release date
January 2010
November 2008
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Supplementary power connectors
1x 6-pin
1x 6-pin + 1x 8-pin
Core clock speed
575 MHz
625 MHz
Floating-point performance
736.0 gflops
2x 1,000.0 gflops
Manufacturing process technology
55 nm
55 nm
Number of transistors
956 million
956 million
Pipelines / CUDA cores
640
800
Power consumption (TDP)
110 Watt
250 Watt
Texture fill rate
18.40
25.00
Memory type
GDDR5
GDDR3
Maximum RAM amount
512 MB
512 MB
Memory bus width
256 Bit
256 Bit
Memory clock speed
3600 MHz
1990 MHz
Memory bandwidth
115.2 GB/s
63.68 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x VGA
4x DVI, 1x S-Video
HDMI
+
-
DirectX
10.1 (10_1)
10.1 (10_1)
OpenCL
1.1
1.1
OpenGL
3.3
3.3
Shader Model
4.1
4.1
Vulkan
N/A
N/A