AMD Radeon HD 6870 1600SP Edition vs ATI Radeon HD 3870 X2

VS

AMD Radeon HD 6870 1600SP Edition

ATI Radeon HD 3870 X2

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 1600SP Edition and 512MB VRAM Radeon HD 3870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 1600SP Edition 's Advantages

Released 5 years late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (134.4GB/s vs 57.66GB/s)

1280 additional rendering cores

ATI Radeon HD 3870 X2 's Advantages

Lower TDP (165W vs 175W)

Score

Benchmark

FP32 (float)

Radeon HD 6870 1600SP Edition +415%

2.72 TFLOPS

Radeon HD 3870 X2

0.528 TFLOPS

Radeon HD 6870 1600SP Edition

VS

Radeon HD 3870 X2

Graphics Card

Jan 2013

Release Date

Jan 2008

Northern Islands

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1050 MHz

Memory Clock

901 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

256bit

134.4GB/s

Bandwidth

57.66GB/s

Render Config

20

Compute Units

4

-

1600

Shading Units

320

80

TMUs

16

32

ROPs

16

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

256 KB

-

Theoretical Performance

27.20 GPixel/s

Pixel Rate

13.20 GPixel/s

68.00 GTexel/s

Texture Rate

13.20 GTexel/s

-

2.720 TFLOPS

FP32 (float)

528.0 GFLOPS

544.0 GFLOPS

FP64 (double)

105.6 GFLOPS

Board Design

175W

TDP

165W

450 W

Suggested PSU

450 W

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

Outputs

2x DVI 1x S-Video

2x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Cypress

GPU Name

R680

Cypress XT (215-0735033)

GPU Variant

R680 XT (215-0708017)

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

2.154 billion

Transistors

0.666 billion

334 mm²

Die Size

192 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3 (full) 4.0 (partial)

1.2

OpenCL

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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