AMD Radeon HD 6870 vs ATI Radeon HD 2900 XTX

VS

AMD Radeon HD 6870

ATI Radeon HD 2900 XTX

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 and 512MB VRAM Radeon HD 2900 XTX to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 's Advantages

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (134.4GB/s vs 106.0GB/s)

800 additional rendering cores

Lower TDP (151W vs 240W)

Score

Benchmark

FP32 (float)

Radeon HD 6870 +323%

2.016 TFLOPS

Radeon HD 2900 XTX

0.476 TFLOPS

Radeon HD 6870

VS

Radeon HD 2900 XTX

Graphics Card

Oct 2010

Release Date

Unknown

Northern Islands

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 1.0 x16

Clock Speeds

-

1050 MHz

Memory Clock

828 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

512bit

134.4GB/s

Bandwidth

106.0GB/s

Render Config

14

Compute Units

4

-

1120

Shading Units

320

56

TMUs

16

32

ROPs

16

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

256 KB

-

Theoretical Performance

28.80 GPixel/s

Pixel Rate

11.89 GPixel/s

50.40 GTexel/s

Texture Rate

11.89 GTexel/s

-

2.016 TFLOPS

FP32 (float)

475.5 GFLOPS

-

Board Design

151W

TDP

240W

450 W

Suggested PSU

550 W

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

Outputs

2x DVI 1x S-Video

2x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

Barts

GPU Name

R600

Barts XT (215-0798000)

GPU Variant

R600 XTX A11 (215RGMDKA11FG)

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

80 nm

1.7 billion

Transistors

0.72 billion

255 mm²

Die Size

420 mm²

Graphics Features

11.2 (11_0)

DirectX

10.0 (10_0)

4.4

OpenGL

3.3 (full) 4.0 (partial)

1.2

OpenCL

N/A

Vulkan

N/A

-

5.0

Shader Model

4.0

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