AMD Radeon HD 7950 vs ATI Radeon HD 4870 Mac Edition

VS

AMD Radeon HD 7950

ATI Radeon HD 4870 Mac Edition

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7950 and 512MB VRAM Radeon HD 4870 Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7950 's Advantages

Released 3 years late

More VRAM (3GB vs 512GB)

Larger VRAM bandwidth (240.0GB/s vs 108.8GB/s)

992 additional rendering cores

ATI Radeon HD 4870 Mac Edition 's Advantages

Lower TDP (150W vs 200W)

Score

Benchmark

FP32 (float)

Radeon HD 7950 +138%

2.867 TFLOPS

Radeon HD 4870 Mac Edition

1.2 TFLOPS

Radeon HD 7950

VS

Radeon HD 4870 Mac Edition

Graphics Card

Jan 2012

Release Date

Jan 2009

Southern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

850 MHz

Memory

3GB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

240.0GB/s

Bandwidth

108.8GB/s

Render Config

28

Compute Units

10

-

1792

Shading Units

800

112

TMUs

40

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

25.60 GPixel/s

Pixel Rate

12.00 GPixel/s

89.60 GTexel/s

Texture Rate

30.00 GTexel/s

-

2.867 TFLOPS

FP32 (float)

1200 GFLOPS

716.8 GFLOPS

FP64 (double)

240.0 GFLOPS

Board Design

200W

TDP

150W

550 W

Suggested PSU

450 W

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

Outputs

1x DVI 1x mini-DisplayPort 1.0

2x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

Tahiti

GPU Name

RV770

Tahiti PRO (215-0821056)

GPU Variant

RV770 XT Mac (215-0669080)

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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