ATI Radeon HD 4870 Mac Edition vs ATI Radeon HD 2900 XT

VS

ATI Radeon HD 4870 Mac Edition

ATI Radeon HD 2900 XT

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4870 Mac Edition and 512MB VRAM Radeon HD 2900 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

Released 1 years and 8 months late

Larger VRAM bandwidth (108.8GB/s vs 106.0GB/s)

480 additional rendering cores

Lower TDP (150W vs 215W)

Score

Benchmark

FP32 (float)

Radeon HD 4870 Mac Edition +152%

1.2 TFLOPS

Radeon HD 2900 XT

0.476 TFLOPS

Radeon HD 4870 Mac Edition

VS

Radeon HD 2900 XT

Graphics Card

Jan 2009

Release Date

May 2007

Radeon R700

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 1.0 x16

Clock Speeds

-

850 MHz

Memory Clock

828 MHz

Memory

512MB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

512bit

108.8GB/s

Bandwidth

106.0GB/s

Render Config

10

Compute Units

4

-

800

Shading Units

320

40

TMUs

16

ROPs

16

-

16 KB (per CU)

L1 Cache

-

256 KB

L2 Cache

256 KB

-

Theoretical Performance

12.00 GPixel/s

Pixel Rate

11.89 GPixel/s

30.00 GTexel/s

Texture Rate

11.89 GTexel/s

-

1200 GFLOPS

FP32 (float)

475.5 GFLOPS

240.0 GFLOPS

FP64 (double)

-

Board Design

150W

TDP

215W

450 W

Suggested PSU

550 W

1x DVI 1x mini-DisplayPort 1.0

Outputs

2x DVI 1x S-Video

2x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

RV770

GPU Name

R600

RV770 XT Mac (215-0669080)

GPU Variant

R600 XT (215RGMDKA13FG)

TeraScale

Architecture

TeraScale

TSMC

Foundry

TSMC

55 nm

Process Size

80 nm

0.956 billion

Transistors

0.72 billion

256 mm²

Die Size

420 mm²

Graphics Features

10.1 (10_1)

DirectX

10.0 (10_0)

3.3

OpenGL

3.3 (full) 4.0 (partial)

1.1

OpenCL

N/A

Vulkan

N/A

-

4.1

Shader Model

4.0

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