GeForce GTX 680MX and Radeon HD 6990M Crossfire - video card comparison
GeForce GTX 680MX
Radeon HD 6990M Crossfire
Architecture
Kepler (2012−2018)
Terascale 2 (2009−2015)
GPU code name
-
Blackcomb XTX
Market segment
Laptop
Laptop
Release date
October 2012
July 2011
Bus support
PCI Express 3.0
-
SLI options
+
-
Core clock speed
720 MHz
715 MHz
CUDA cores
1536
-
Manufacturing process technology
28 nm
40 nm
Number of transistors
3540 Million
2x1700 Million
Pipelines / CUDA cores
1536
2240
Power consumption (TDP)
122 Watt
-
Texture fill rate
92.2 billion/sec
-
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2x2 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
2500 MHz
900 MHz
Memory bandwidth
160 GB/s
-
Shared memory
-
-
DirectX
12 API
11
CUDA
+
-
OpenCL
1.1
-
OpenGL
4.5
-
3D Vision
+
-
Optimus
+
-