AMD Radeon HD 7970 vs ATI Radeon HD 4855

VS

AMD Radeon HD 7970

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 and 512MB VRAM Radeon HD 4855 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7970 's Advantages

Released 1 years and 11 months late

More VRAM (3GB vs 512GB)

Larger VRAM bandwidth (264.0GB/s vs 115.2GB/s)

1408 additional rendering cores

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 250W)

Score

Benchmark

FP32 (float)

Radeon HD 7970 +414%

3.789 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon HD 7970

VS

Radeon HD 4855

Graphics Card

Dec 2011

Release Date

Jan 2010

Southern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1375 MHz

Memory Clock

900 MHz

Memory

3GB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

264.0GB/s

Bandwidth

115.2GB/s

Render Config

32

Compute Units

8

-

2048

Shading Units

640

128

TMUs

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

29.60 GPixel/s

Pixel Rate

9.200 GPixel/s

118.4 GTexel/s

Texture Rate

18.40 GTexel/s

-

3.789 TFLOPS

FP32 (float)

736.0 GFLOPS

947.2 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

250W

TDP

110W

600 W

Suggested PSU

300 W

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Tahiti

GPU Name

RV770

Tahiti XT (215-0821060)

GPU Variant

RV770 PRO (215-0669065)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

4.313 billion

Transistors

0.956 billion

352 mm²

Die Size

256 mm²

Graphics Features

12 (11_1)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

1.2

OpenCL

1.1

1.2

Vulkan

N/A

-

5.1

Shader Model

4.1

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