NVIDIA Tesla K20c vs NVIDIA Tesla K40c

VS

NVIDIA Tesla K20c

NVIDIA Tesla K40c

We compared two Professional market GPUs: 5GB VRAM Tesla K20c and 12GB VRAM Tesla K40c to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA Tesla K20c 's Advantages

Lower TDP (225W vs 245W)

NVIDIA Tesla K40c 's Advantages

Released 11 months late

Boost Clock876MHz

More VRAM (12GB vs 5GB)

Larger VRAM bandwidth (288.4GB/s vs 208.0GB/s)

384 additional rendering cores

Score

Benchmark

FP32 (float)

Tesla K20c

3.524 TFLOPS

Tesla K40c +43%

5.046 TFLOPS

Tesla K20c

VS

Tesla K40c

Graphics Card

Nov 2012

Release Date

Oct 2013

Tesla

Generation

Tesla

Professional

Type

Professional

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

745 MHz

-

Boost Clock

876 MHz

1300 MHz

Memory Clock

1502 MHz

Memory

5GB

Memory Size

12GB

GDDR5

Memory Type

GDDR5

320bit

Memory Bus

384bit

208.0GB/s

Bandwidth

288.4GB/s

Render Config

-

2496

Shading Units

2880

208

TMUs

240

40

ROPs

48

-

16 KB (per SMX)

L1 Cache

16 KB (per SMX)

1280 KB

L2 Cache

1536 KB

-

Theoretical Performance

36.71 GPixel/s

Pixel Rate

52.56 GPixel/s

146.8 GTexel/s

Texture Rate

210.2 GTexel/s

-

3.524 TFLOPS

FP32 (float)

5.046 TFLOPS

1175 GFLOPS

FP64 (double)

1.682 TFLOPS

Board Design

225W

TDP

245W

550 W

Suggested PSU

550 W

No outputs

Outputs

No outputs

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

GK110

GPU Name

GK180

GK110-885-KA-A1

GPU Variant

GK180-890-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_0)

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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