Radeon HD 6990M and GeForce GTX 660M - video card comparison
Radeon HD 6990M
GeForce GTX 660M
Architecture
Terascale 2 (2009−2015)
Kepler (2012−2018)
GPU code name
Blackcomb XTX
N13E-GE
Market segment
Laptop
Laptop
Release date
July 2011
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
MXM-B (3.0)
MXM-B (3.0)
Supplementary power connectors
None
-
SLI options
-
+
Boost clock speed
-
950 MHz
Core clock speed
715 MHz
835 MHz
CUDA cores
-
384
Floating-point performance
1,601.6 gflops
729.6 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
1,700 million
1,270 million
Pipelines / CUDA cores
1120
384
Power consumption (TDP)
100 Watt
50 Watt
Texture fill rate
40.04
30.4 billion/sec
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
256 Bit
128bit
Memory clock speed
900 MHz
2000 MHz
Memory bandwidth
115.2 GB/s
64.0 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
11.2 (11_0)
12 API
CUDA
-
+
OpenCL
1.2
1.1
OpenGL
4.4
4.5
Shader Model
5.0
5.1
Vulkan
N/A
1.1.126
Optimus
-
+