NVIDIA Tesla K20X vs NVIDIA Tesla K40m
We compared two Professional market GPUs: 6GB VRAM Tesla K20X and 12GB VRAM Tesla K40m to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA Tesla K20X 's Advantages
Lower TDP (235W vs 245W)
NVIDIA Tesla K40m 's Advantages
Released 1 years late
Boost Clock876MHz
More VRAM (12GB vs 6GB)
Larger VRAM bandwidth (288.4GB/s vs 249.6GB/s)
192 additional rendering cores
Score
Benchmark
FP32 (float)
Tesla K20X
3.935 TFLOPS
Tesla K40m
+28%
5.046 TFLOPS
Graphics Card
Nov 2012
Release Date
Nov 2013
Tesla
Generation
Tesla
Professional
Type
Professional
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
Base Clock
745 MHz
-
Boost Clock
876 MHz
1300 MHz
Memory Clock
1502 MHz
Memory
6GB
Memory Size
12GB
GDDR5
Memory Type
GDDR5
384bit
Memory Bus
384bit
249.6GB/s
Bandwidth
288.4GB/s
Render Config
-
-
-
-
-
-
2688
Shading Units
2880
224
TMUs
240
48
ROPs
48
-
-
-
-
-
-
16 KB (per SMX)
L1 Cache
16 KB (per SMX)
1536 KB
L2 Cache
1536 KB
-
-
-
Theoretical Performance
40.99 GPixel/s
Pixel Rate
52.56 GPixel/s
164.0 GTexel/s
Texture Rate
210.2 GTexel/s
-
-
-
3.935 TFLOPS
FP32 (float)
5.046 TFLOPS
1312 GFLOPS
FP64 (double)
1.682 TFLOPS
Board Design
235W
TDP
245W
550 W
Suggested PSU
550 W
No outputs
Outputs
No outputs
1x 6-pin + 1x 8-pin
Power Connectors
-
Graphics Processor
GK110
GPU Name
GK110B
-
-
-
Kepler
Architecture
Kepler
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
7.08 billion
Transistors
7.08 billion
561 mm²
Die Size
561 mm²
Graphics Features
12 (11_0)
DirectX
12 (11_1)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.1
Vulkan
1.1
3.5
CUDA
3.5
5.1
Shader Model
5.1
