NVIDIA Tesla K40c vs NVIDIA Tesla K20X

VS

NVIDIA Tesla K40c

NVIDIA Tesla K20X

We compared two Professional market GPUs: 12GB VRAM Tesla K40c and 6GB VRAM Tesla K20X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA Tesla K40c 's Advantages

Released 11 months late

Boost Clock876MHz

More VRAM (12GB vs 6GB)

Larger VRAM bandwidth (288.4GB/s vs 249.6GB/s)

192 additional rendering cores

NVIDIA Tesla K20X 's Advantages

Lower TDP (235W vs 245W)

Score

Benchmark

FP32 (float)

Tesla K40c +28%

5.046 TFLOPS

Tesla K20X

3.935 TFLOPS

Tesla K40c

VS

Tesla K20X

Graphics Card

Oct 2013

Release Date

Nov 2012

Tesla

Generation

Tesla

Professional

Type

Professional

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

745 MHz

Base Clock

-

876 MHz

Boost Clock

-

1502 MHz

Memory Clock

1300 MHz

Memory

12GB

Memory Size

6GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

384bit

288.4GB/s

Bandwidth

249.6GB/s

Render Config

-

2880

Shading Units

2688

240

TMUs

224

48

ROPs

48

-

16 KB (per SMX)

L1 Cache

16 KB (per SMX)

1536 KB

L2 Cache

1536 KB

-

Theoretical Performance

52.56 GPixel/s

Pixel Rate

40.99 GPixel/s

210.2 GTexel/s

Texture Rate

164.0 GTexel/s

-

5.046 TFLOPS

FP32 (float)

3.935 TFLOPS

1.682 TFLOPS

FP64 (double)

1312 GFLOPS

Board Design

245W

TDP

235W

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

GK180

GPU Name

GK110

GK180-890-A1

GPU Variant

-

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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