NVIDIA Tesla K40d vs NVIDIA Tesla K20c

VS

NVIDIA Tesla K40d

NVIDIA Tesla K20c

We compared two Professional market GPUs: 12GB VRAM Tesla K40d and 5GB VRAM Tesla K20c to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA Tesla K40d 's Advantages

Released 1 years late

Boost Clock876MHz

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 K40d +43%

5.046 TFLOPS

Tesla K20c

3.524 TFLOPS

Tesla K40d

VS

Tesla K20c

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

745 MHz

Base Clock

-

876 MHz

Boost Clock

-

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

52.56 GPixel/s

Pixel Rate

36.71 GPixel/s

210.2 GTexel/s

Texture Rate

146.8 GTexel/s

-

5.046 TFLOPS

FP32 (float)

3.524 TFLOPS

1.682 TFLOPS

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

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