ATI Radeon HD 4870 Mac Edition vs AMD Radeon HD 7870 XT

VS

ATI Radeon HD 4870 Mac Edition

AMD Radeon HD 7870 XT

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4870 Mac Edition and 2GB VRAM Radeon HD 7870 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 4870 Mac Edition 's Advantages

Lower TDP (150W vs 185W)

AMD Radeon HD 7870 XT 's Advantages

Released 3 years and 10 months late

Boost Clock975MHz

More VRAM (2GB vs 512GB)

Larger VRAM bandwidth (192.0GB/s vs 108.8GB/s)

736 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 4870 Mac Edition

1.2 TFLOPS

Radeon HD 7870 XT +149%

2.995 TFLOPS

Radeon HD 4870 Mac Edition

VS

Radeon HD 7870 XT

Graphics Card

Jan 2009

Release Date

Nov 2012

Radeon R700

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

925 MHz

-

Boost Clock

975 MHz

850 MHz

Memory Clock

1500 MHz

Memory

512MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

108.8GB/s

Bandwidth

192.0GB/s

Render Config

10

Compute Units

24

-

800

Shading Units

1536

40

TMUs

96

16

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

12.00 GPixel/s

Pixel Rate

31.20 GPixel/s

30.00 GTexel/s

Texture Rate

93.60 GTexel/s

-

1200 GFLOPS

FP32 (float)

2.995 TFLOPS

240.0 GFLOPS

FP64 (double)

748.8 GFLOPS

Board Design

150W

TDP

185W

450 W

Suggested PSU

450 W

1x DVI 1x mini-DisplayPort 1.0

Outputs

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

2x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

RV770

GPU Name

Tahiti

RV770 XT Mac (215-0669080)

GPU Variant

Tahiti LE (215-0821122)

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

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

-

4.1

Shader Model

5.1

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