NVIDIA Tesla K40d vs NVIDIA Tesla K20s
GPU Specs Compare
Graphics Card
Release Date
Nov 2013
Feb 2013
Generation
Tesla Kepler
Tesla
Type
Professional
Professional
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Base Clock
745 MHz
-
Boost Clock
876 MHz
-
Memory Clock
1502 MHz
1300 MHz
Memory
Memory Size
12GB
5GB
Memory Type
GDDR5
GDDR5
Memory Bus
384bit
320bit
Bandwidth
288.4GB/s
208.0GB/s
Render Config
Shading Units
2880
2496
TMUs
240
208
ROPs
48
40
L1 Cache
16 KB (per SMX)
16 KB (per SMX)
L2 Cache
1536 KB
1280 KB
Theoretical Performance
Pixel Rate
52.56 GPixel/s
29.90 GPixel/s
Texture Rate
210.2 GTexel/s
119.6 GTexel/s
FP32 (float)
5.046 TFLOPS
2.870 TFLOPS
FP64 (double)
1.682 TFLOPS
956.8 GFLOPS
Graphics Processor
GPU Name
GK110B
GK110
Architecture
Kepler
Kepler
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
7.08 billion
7.08 billion
Die Size
561 mm²
561 mm²
Board Design
TDP
245W
225W
Suggested PSU
550 W
550 W
Outputs
No outputs
No outputs
Graphics Features
DirectX
12 (11_1)
12 (11_0)
OpenGL
4.6
4.6
OpenCL
3.0
3.0
Vulkan
1.2.175
1.1
CUDA
3.5
3.5
Shader Model
6.5 (5.1)
5.1