Tesla K20X and Tesla K40d - video card comparison
Tesla K20X
Tesla K40d
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK110
GK110B
Market segment
Workstation
Workstation
Release date
November 2012
November 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin + 1x 8-pin
-
Boost clock speed
-
876 MHz
Core clock speed
732 MHz
745 MHz
Floating-point performance
3,935 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
7,080 million
7,080 million
Pipelines / CUDA cores
2688
2880
Power consumption (TDP)
235 Watt
245 Watt
Texture fill rate
164.0
210.2
Memory type
GDDR5
GDDR5
Maximum RAM amount
6 GB
12 GB
Memory bus width
384 Bit
384 Bit
Memory clock speed
5200 MHz
6008 MHz
Memory bandwidth
249.6 GB/s
288.4 GB/s
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 (11_1)
CUDA
3.5
3.5
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126