ATI Radeon HD 4870 vs ATI Radeon HD 2900 GT

VS

ATI Radeon HD 4870

ATI Radeon HD 2900 GT

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4870 and 256MB VRAM Radeon HD 2900 GT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 4870 's Advantages

Released 7 months late

More VRAM (512GB vs 256GB)

Larger VRAM bandwidth (115.2GB/s vs 51.20GB/s)

560 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 4870 +316%

1.2 TFLOPS

Radeon HD 2900 GT

0.288 TFLOPS

Radeon HD 4870

VS

Radeon HD 2900 GT

Graphics Card

Jun 2008

Release Date

Nov 2007

Radeon R700

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 1.0 x16

Clock Speeds

-

900 MHz

Memory Clock

800 MHz

Memory

512MB

Memory Size

256MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

256bit

115.2GB/s

Bandwidth

51.20GB/s

Render Config

10

Compute Units

3

-

800

Shading Units

240

40

TMUs

12

16

ROPs

12

-

16 KB (per CU)

L1 Cache

-

256 KB

L2 Cache

128 KB

-

Theoretical Performance

12.00 GPixel/s

Pixel Rate

7.212 GPixel/s

30.00 GTexel/s

Texture Rate

7.212 GTexel/s

-

1200 GFLOPS

FP32 (float)

288.5 GFLOPS

240.0 GFLOPS

FP64 (double)

-

Board Design

150W

TDP

150W

450 W

Suggested PSU

450 W

2x DVI 1x S-Video

Outputs

2x DVI 1x S-Video

2x 6-pin

Power Connectors

1x 8-pin

Graphics Processor

RV770

GPU Name

R600

RV770 XT (215-0669049)

GPU Variant

R600 GT (215RGFDKA13FG)

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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