Radeon HD 6990 and GeForce GTX 660M - video card comparison
Passmark - benchmark score Radeon HD 6990 vs GeForce GTX 660M
Radeon HD 6990
3103
GeForce GTX 660M
1478
Radeon HD 6990
GeForce GTX 660M
Architecture
TeraScale 3 (2010−2013)
Kepler (2012−2018)
GPU code name
Antilles
N13E-GE
Market segment
Desktop
Laptop
Release date
March 2011
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 2.0 x16
MXM-B (3.0)
Supplementary power connectors
2x 8-pin
-
SLI options
-
+
Boost clock speed
-
950 MHz
Core clock speed
830 MHz
835 MHz
CUDA cores
-
384
Floating-point performance
2x 2,549.8 gflops
729.6 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
2,640 million
1,270 million
Pipelines / CUDA cores
1536
384
Power consumption (TDP)
375 Watt
50 Watt
Texture fill rate
79.68
30.4 billion/sec
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
256 Bit
128bit
Memory clock speed
5000 MHz
2000 MHz
Memory bandwidth
160.0 GB/s
64.0 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 4x mini-DisplayPort
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
-
+