GeForce GTX 680M and Radeon HD 6990M - video card comparison
GeForce GTX 680M
Radeon HD 6990M
Architecture
Kepler (2012−2018)
Terascale 2 (2009−2015)
GPU code name
N13E-GTX
Blackcomb XTX
Market segment
Laptop
Laptop
Release date
June 2012
July 2011
Bus support
PCI Express 3.0
-
Interface
MXM-B (3.0)
MXM-B (3.0)
Supplementary power connectors
None
None
SLI options
+
-
Boost clock speed
758 MHz
-
Core clock speed
720 MHz
715 MHz
CUDA cores
1344
-
Floating-point performance
2,038 gflops
1,601.6 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
3,540 million
1,700 million
Pipelines / CUDA cores
1344
1120
Power consumption (TDP)
100 Watt
100 Watt
Texture fill rate
80.6 billion/sec
40.04
Memory type
GDDR5
GDDR5
Maximum RAM amount
4 GB
2 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
1800 MHz
900 MHz
Memory bandwidth
115.2 GB/s
115.2 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 API
11.2 (11_0)
CUDA
+
-
OpenCL
1.1
1.2
OpenGL
4.5
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
N/A
Optimus
+
-