Radeon HD 7990 and Radeon HD 7770M - video card comparison
Radeon HD 7990
Radeon HD 7770M
Architecture
GCN 1.0 (2012−2020)
GCN (2011−2017)
GPU code name
Malta
Chelsea XT
Market segment
Desktop
Laptop
Release date
April 2013
April 2012
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
2x 8-pin
-
Boost clock speed
1000 MHz
-
Core clock speed
950 MHz
675 MHz
Floating-point performance
2x 4,096 gflops
691.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
4,313 million
1,500 million
Pipelines / CUDA cores
2048
512
Power consumption (TDP)
375 Watt
32 Watt
Texture fill rate
128.0
21.60
Memory type
GDDR5
GDDR5
Maximum RAM amount
3 GB
1 GB
Memory bus width
384 Bit
128 Bit
Memory clock speed
6000 MHz
4000 MHz
Memory bandwidth
288.0 GB/s
64 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 4x mini-DisplayPort
No outputs
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