ATI Radeon HD 3870 Mac Edition vs AMD Radeon HD 6850

VS

ATI Radeon HD 3870 Mac Edition

AMD Radeon HD 6850

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 3870 Mac Edition and 1024MB VRAM Radeon HD 6850 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 3870 Mac Edition 's Advantages

Lower TDP (106W vs 127W)

AMD Radeon HD 6850 's Advantages

Released 2 years and 4 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (128.0GB/s vs 72.06GB/s)

640 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 3870 Mac Edition

0.497 TFLOPS

Radeon HD 6850 +199%

1.488 TFLOPS

Radeon HD 3870 Mac Edition

VS

Radeon HD 6850

Graphics Card

Jun 2008

Release Date

Oct 2010

Radeon R600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1126 MHz

Memory Clock

1000 MHz

Memory

512MB

Memory Size

1024MB

GDDR4

Memory Type

GDDR5

256bit

Memory Bus

256bit

72.06GB/s

Bandwidth

128.0GB/s

Render Config

4

Compute Units

12

-

320

Shading Units

960

16

TMUs

48

16

ROPs

32

-

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

12.43 GPixel/s

Pixel Rate

24.80 GPixel/s

12.43 GTexel/s

Texture Rate

37.20 GTexel/s

-

497.3 GFLOPS

FP32 (float)

1488 GFLOPS

99.46 GFLOPS

FP64 (double)

-

Board Design

106W

TDP

127W

300 W

Suggested PSU

300 W

2x DVI 1x S-Video

Outputs

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

1x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

RV670

GPU Name

Barts

RV670 XT (215-0708005)

GPU Variant

Barts PRO (215-0798006)

TeraScale

Architecture

TeraScale 2

TSMC

Foundry

TSMC

55 nm

Process Size

40 nm

0.666 billion

Transistors

1.7 billion

192 mm²

Die Size

255 mm²

Graphics Features

10.1 (10_1)

DirectX

11.2 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.4

N/A

OpenCL

1.2

N/A

Vulkan

N/A

-

4.1

Shader Model

5.0

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