NVIDIA Tesla K20m vs NVIDIA Tesla C870

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We compared two Professional market GPUs: 5GB VRAM Tesla K20m and 1536MB VRAM Tesla C870 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA Tesla K20m 's Advantages

Released 5 years and 8 months late

More VRAM (5GB vs 1GB)

Larger VRAM bandwidth (208.0GB/s vs 76.80GB/s)

2368 additional rendering cores

NVIDIA Tesla C870 's Advantages

Lower TDP (171W vs 225W)

Score

Benchmark

FP32 (float)

Tesla K20m +918%

3.524 TFLOPS

Tesla C870

0.346 TFLOPS

Tesla K20m

VS

Tesla C870

Graphics Card

Jan 2013

Release Date

May 2007

Tesla

Generation

Tesla

Professional

Type

Professional

PCIe 2.0 x16

Bus Interface

PCIe 1.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

1300 MHz

Memory Clock

800 MHz

Memory

5GB

Memory Size

1536MB

GDDR5

Memory Type

GDDR3

320bit

Memory Bus

384bit

208.0GB/s

Bandwidth

76.80GB/s

Render Config

-

SM Count

16

-

Compute Units

-

2496

Shading Units

128

208

TMUs

32

40

ROPs

24

-

Tensor Cores

-

RT Cores

-

16 KB (per SMX)

L1 Cache

-

1280 KB

L2 Cache

96 KB

Theoretical Performance

36.71 GPixel/s

Pixel Rate

14.40 GPixel/s

146.8 GTexel/s

Texture Rate

38.40 GTexel/s

-

FP16 (half)

-

3.524 TFLOPS

FP32 (float)

345.6 GFLOPS

1175 GFLOPS

FP64 (double)

-

Graphics Processor

GK110

GPU Name

G80

-

GPU Variant

-

Kepler

Architecture

Tesla

TSMC

Foundry

TSMC

28 nm

Process Size

90 nm

7.08 billion

Transistors

0.681 billion

561 mm²

Die Size

484 mm²

Board Design

225W

TDP

171W

550 W

Suggested PSU

450 W

No outputs

Outputs

No outputs

1x 6-pin + 1x 8-pin

Power Connectors

2x 6-pin

Graphics Features

12 (11_0)

DirectX

11.1 (10_0)

4.6

OpenGL

3.3

3.0

OpenCL

1.1 (1.0)

1.1

Vulkan

N/A

3.5

CUDA

1.0

5.1

Shader Model

4.0

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