NVIDIA Tesla K20X vs NVIDIA Tesla K40d

VS

NVIDIA Tesla K20X

NVIDIA Tesla K40d

We compared two Professional market GPUs: 6GB VRAM Tesla K20X and 12GB VRAM Tesla K40d 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 K40d '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 K40d +28%

5.046 TFLOPS

Tesla K20X

VS

Tesla K40d

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

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