ATI Radeon HD 4855 vs AMD Radeon HD 7970

VS

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

Main Differences

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 250W)

AMD Radeon HD 7970 's Advantages

Released 1 years and 11 months late

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

1408 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 4855

0.736 TFLOPS

Radeon HD 7970 +414%

3.789 TFLOPS

Radeon HD 4855

VS

Radeon HD 7970

Graphics Card

Jan 2010

Release Date

Dec 2011

Radeon R700

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

900 MHz

Memory Clock

1375 MHz

Memory

512MB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

384bit

115.2GB/s

Bandwidth

264.0GB/s

Render Config

-

SM Count

-

8

Compute Units

32

640

Shading Units

2048

32

TMUs

128

16

ROPs

32

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

768 KB

Theoretical Performance

9.200 GPixel/s

Pixel Rate

29.60 GPixel/s

18.40 GTexel/s

Texture Rate

118.4 GTexel/s

-

FP16 (half)

-

736.0 GFLOPS

FP32 (float)

3.789 TFLOPS

147.2 GFLOPS

FP64 (double)

947.2 GFLOPS

Graphics Processor

RV770

GPU Name

Tahiti

RV770 PRO (215-0669065)

GPU Variant

Tahiti XT (215-0821060)

TeraScale

Architecture

GCN 1.0

TSMC

Foundry

TSMC

55 nm

Process Size

28 nm

0.956 billion

Transistors

4.313 billion

256 mm²

Die Size

352 mm²

Board Design

110W

TDP

250W

300 W

Suggested PSU

600 W

1x DVI 1x HDMI 1.3a 1x VGA

Outputs

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

1x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Features

10.1 (10_1)

DirectX

12 (11_1)

3.3

OpenGL

4.6

1.1

OpenCL

1.2

N/A

Vulkan

1.2

-

CUDA

-

4.1

Shader Model

5.1

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