AMD Radeon HD 6870 X2 vs ATI Radeon HD 2900 XT

VS

AMD Radeon HD 6870 X2

ATI Radeon HD 2900 XT

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 X2 and 512MB VRAM Radeon HD 2900 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 X2 's Advantages

Released 4 years and 2 months late

More VRAM (1024GB vs 512GB)

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

800 additional rendering cores

ATI Radeon HD 2900 XT 's Advantages

Lower TDP (215W vs 300W)

Score

Benchmark

FP32 (float)

Radeon HD 6870 X2 +323%

2.016 TFLOPS

Radeon HD 2900 XT

0.476 TFLOPS

Radeon HD 6870 X2

VS

Radeon HD 2900 XT

Graphics Card

Jul 2011

Release Date

May 2007

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

300W

TDP

215W

700 W

Suggested PSU

550 W

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

Outputs

2x DVI 1x S-Video

-

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Barts

GPU Name

R600

Barts XT (215-0798000)

GPU Variant

R600 XT (215RGMDKA13FG)

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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