AMD Radeon HD 6870 vs ATI Radeon HD 4580

VS

AMD Radeon HD 6870

ATI Radeon HD 4580

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 and 512MB VRAM Radeon HD 4580 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 's Advantages

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (134.4GB/s vs 22.18GB/s)

1000 additional rendering cores

ATI Radeon HD 4580 's Advantages

Released 1 years and 1 months late

Lower TDP (65W vs 151W)

Score

Benchmark

FP32 (float)

Radeon HD 6870 +955%

2.016 TFLOPS

Radeon HD 4580

0.191 TFLOPS

Radeon HD 6870

VS

Radeon HD 4580

Graphics Card

Oct 2010

Release Date

Nov 2011

Northern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1050 MHz

Memory Clock

693 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

128bit

134.4GB/s

Bandwidth

22.18GB/s

Render Config

14

Compute Units

3

-

1120

Shading Units

120

56

TMUs

8

32

ROPs

4

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

128 KB

-

Theoretical Performance

28.80 GPixel/s

Pixel Rate

3.184 GPixel/s

50.40 GTexel/s

Texture Rate

6.368 GTexel/s

-

2.016 TFLOPS

FP32 (float)

191.0 GFLOPS

-

Board Design

151W

TDP

65W

450 W

Suggested PSU

250 W

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

Outputs

2x DVI 1x S-Video

2x 6-pin

Power Connectors

None

Graphics Processor

Barts

GPU Name

RV635

Barts XT (215-0798000)

GPU Variant

RV635 PRO (215-0682008)

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

1.7 billion

Transistors

0.378 billion

255 mm²

Die Size

135 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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