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

VS

ATI Radeon HD 2900 XT

ATI Radeon HD 4870 Mac Edition

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT 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

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 2900 XT

0.476 TFLOPS

Radeon HD 4870 Mac Edition +152%

1.2 TFLOPS

Radeon HD 2900 XT

VS

Radeon HD 4870 Mac Edition

Graphics Card

May 2007

Release Date

Jan 2009

Radeon R600

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

828 MHz

Memory Clock

850 MHz

Memory

512MB

Memory Size

512MB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

256bit

106.0GB/s

Bandwidth

108.8GB/s

Render Config

4

Compute Units

10

-

320

Shading Units

800

16

TMUs

40

16

ROPs

16

-

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

11.89 GPixel/s

Pixel Rate

12.00 GPixel/s

11.89 GTexel/s

Texture Rate

30.00 GTexel/s

-

475.5 GFLOPS

FP32 (float)

1200 GFLOPS

-

FP64 (double)

240.0 GFLOPS

Board Design

215W

TDP

150W

550 W

Suggested PSU

450 W

2x DVI 1x S-Video

Outputs

1x DVI 1x mini-DisplayPort 1.0

1x 6-pin + 1x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

R600

GPU Name

RV770

R600 XT (215RGMDKA13FG)

GPU Variant

RV770 XT Mac (215-0669080)

TeraScale

Architecture

TeraScale

TSMC

Foundry

TSMC

80 nm

Process Size

55 nm

0.72 billion

Transistors

0.956 billion

420 mm²

Die Size

256 mm²

Graphics Features

10.0 (10_0)

DirectX

10.1 (10_1)

3.3 (full) 4.0 (partial)

OpenGL

3.3

N/A

OpenCL

1.1

N/A

Vulkan

N/A

-

4.0

Shader Model

4.1

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