ATI Radeon HD 4870 vs AMD Radeon HD 6770

VS

ATI Radeon HD 4870

AMD Radeon HD 6770

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4870 and 1024MB VRAM Radeon HD 6770 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 4870 's Advantages

Larger VRAM bandwidth (115.2GB/s vs 76.80GB/s)

AMD Radeon HD 6770 's Advantages

Released 2 years and 7 months late

More VRAM (1024GB vs 512GB)

Lower TDP (108W vs 150W)

Score

Benchmark

FP32 (float)

Radeon HD 4870

1.2 TFLOPS

Radeon HD 6770 +13%

1.36 TFLOPS

Radeon HD 4870

VS

Radeon HD 6770

Graphics Card

Jun 2008

Release Date

Jan 2011

Radeon R700

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

900 MHz

Memory Clock

1200 MHz

Memory

512MB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

115.2GB/s

Bandwidth

76.80GB/s

Render Config

10

Compute Units

10

-

800

Shading Units

800

40

TMUs

40

16

ROPs

16

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

12.00 GPixel/s

Pixel Rate

13.60 GPixel/s

30.00 GTexel/s

Texture Rate

34.00 GTexel/s

-

1200 GFLOPS

FP32 (float)

1360 GFLOPS

240.0 GFLOPS

FP64 (double)

-

Board Design

150W

TDP

108W

450 W

Suggested PSU

300 W

2x DVI 1x S-Video

Outputs

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

2x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

RV770

GPU Name

Juniper

RV770 XT (215-0669049)

GPU Variant

Juniper XT (215-0754013)

TeraScale

Architecture

TeraScale 2

TSMC

Foundry

TSMC

55 nm

Process Size

40 nm

0.956 billion

Transistors

1.04 billion

256 mm²

Die Size

166 mm²

Graphics Features

10.1 (10_1)

DirectX

11.2 (11_0)

3.3

OpenGL

4.4

1.1

OpenCL

1.2

N/A

Vulkan

N/A

-

4.1

Shader Model

5.0

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