Radeon HD 7990 and GeForce GTX 660M Mac Edition - video card comparison
Radeon HD 7990
GeForce GTX 660M Mac Edition
Architecture
GCN 1.0 (2012−2020)
Kepler (2012−2018)
GPU code name
Malta
GK107
Market segment
Desktop
Desktop
Release date
April 2013
April 2013
Interface
PCIe 3.0 x16
MXM-B (3.0)
Supplementary power connectors
2x 8-pin
None
Boost clock speed
1000 MHz
-
Core clock speed
950 MHz
950 MHz
Floating-point performance
2x 4,096 gflops
729.6 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
4,313 million
1,270 million
Pipelines / CUDA cores
2048
384
Power consumption (TDP)
375 Watt
50 Watt
Texture fill rate
128.0
30.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
3 GB
512 MB
Memory bus width
384 Bit
128 Bit
Memory clock speed
6000 MHz
5000 MHz
Memory bandwidth
288.0 GB/s
80 GB/s
Display Connectors
1x DVI, 4x mini-DisplayPort
No outputs
DirectX
12 (11_1)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.2.131
1.1.126