Radeon HD 6850 X2 and GeForce GTX 780M Mac Edition - video card comparison
Radeon HD 6850 X2
GeForce GTX 780M Mac Edition
Architecture
TeraScale 2 (2009−2015)
Kepler (2012−2018)
GPU code name
Barts
GK104
Market segment
Desktop
Desktop
Release date
September 2011
November 2013
Interface
PCIe 2.0 x16
MXM-B (3.0)
Supplementary power connectors
2x 8-pin
-
Boost clock speed
-
797 MHz
Core clock speed
800 MHz
771 MHz
Floating-point performance
2x 1,536.0 gflops
2,448 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
1,700 million
3,540 million
Pipelines / CUDA cores
960
1536
Power consumption (TDP)
254 Watt
122 Watt
Texture fill rate
38.40
102.0
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
4 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
4200 MHz
5000 MHz
Memory bandwidth
134.4 GB/s
160.0 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
11.2 (11_0)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.4
4.6
Shader Model
5.0
5.1
Vulkan
N/A
1.1.126