Radeon HD 6990M and Maxwell GPU Surface Book (940M, GDDR5) - video card comparison
Radeon HD 6990M
Maxwell GPU Surface Book (940M, GDDR5)
Architecture
Terascale 2 (2009−2015)
Maxwell (2014−2018)
GPU code name
Blackcomb XTX
Surface Book
Market segment
Laptop
Laptop
Release date
July 2011
October 2015
Interface
MXM-B (3.0)
-
Supplementary power connectors
None
-
Boost clock speed
-
993 MHz
Core clock speed
715 MHz
954 MHz
Floating-point performance
1,601.6 gflops
-
Manufacturing process technology
40 nm
28 nm
Number of transistors
1,700 million
-
Pipelines / CUDA cores
1120
384
Power consumption (TDP)
100 Watt
-
Texture fill rate
40.04
-
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
256 Bit
64 Bit
Memory clock speed
900 MHz
5012 MHz
Memory bandwidth
115.2 GB/s
-
Shared memory
-
-
Display Connectors
No outputs
-
DirectX
11.2 (11_0)
DirectX 12 (FL 11_0), Shader 5.0
CUDA
-
+
OpenCL
1.2
-
OpenGL
4.4
-
Shader Model
5.0
-
Vulkan
N/A
-
Optimus
-
+