NVIDIA Tesla K40st vs NVIDIA Tesla K20c
We compared two Professional market GPUs: 12GB VRAM Tesla K40st and 5GB VRAM Tesla K20c to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA Tesla K40st 's Advantages
Released 1 years late
More VRAM (12GB vs 5GB)
Larger VRAM bandwidth (288.4GB/s vs 208.0GB/s)
384 additional rendering cores
NVIDIA Tesla K20c 's Advantages
Lower TDP (225W vs 245W)
Score
Benchmark
FP32 (float)
Tesla K40st
3.312 TFLOPS
Tesla K20c
+6%
3.524 TFLOPS
Graphics Card
Nov 2013
Release Date
Nov 2012
Tesla
Generation
Tesla
Professional
Type
Professional
PCIe 3.0 x16
Bus Interface
PCIe 2.0 x16
Clock Speeds
-
-
-
-
-
-
1502 MHz
Memory Clock
1300 MHz
Memory
12GB
Memory Size
5GB
GDDR5
Memory Type
GDDR5
384bit
Memory Bus
320bit
288.4GB/s
Bandwidth
208.0GB/s
Render Config
-
-
-
-
-
-
2880
Shading Units
2496
240
TMUs
208
48
ROPs
40
-
-
-
-
-
-
16 KB (per SMX)
L1 Cache
16 KB (per SMX)
1536 KB
L2 Cache
1280 KB
-
-
-
Theoretical Performance
34.50 GPixel/s
Pixel Rate
36.71 GPixel/s
138.0 GTexel/s
Texture Rate
146.8 GTexel/s
-
-
-
3.312 TFLOPS
FP32 (float)
3.524 TFLOPS
1104 GFLOPS
FP64 (double)
1175 GFLOPS
Board Design
245W
TDP
225W
550 W
Suggested PSU
550 W
No outputs
Outputs
No outputs
-
Power Connectors
1x 6-pin + 1x 8-pin
Graphics Processor
GK110B
GPU Name
GK110
-
GPU Variant
GK110-885-KA-A1
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_1)
DirectX
12 (11_0)
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
