Radeon HD 7770 and Radeon R9 255 OEM - video card comparison
Radeon HD 7770
Radeon R9 255 OEM
Architecture
GCN (2011−2017)
GCN 1.0 (2012−2020)
GPU code name
Cape Verde
Cape Verde
Market segment
Desktop
Desktop
Release date
February 2012
December 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
1x 6-pin
Boost clock speed
-
930 MHz
Core clock speed
1000 MHz
900 MHz
Floating-point performance
-
952.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
1,500 million
Pipelines / CUDA cores
640
512
Power consumption (TDP)
80 Watt
65 Watt
Texture fill rate
40.00
29.76
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
4500 MHz
4600 MHz
Memory bandwidth
72 GB/s
73.6 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
No outputs
Eyefinity
+
-
HDMI
+
-
DirectX
12 (11_1)
12 (11_1)
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.2.131
1.2.131