ATI Radeon HD 2900 XTX vs AMD Radeon HD 6870 1600SP Edition

VS

ATI Radeon HD 2900 XTX

AMD Radeon HD 6870 1600SP Edition

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XTX and 1024MB VRAM Radeon HD 6870 1600SP Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 1600SP Edition 's Advantages

More VRAM (1024GB vs 512GB)

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

1280 additional rendering cores

Lower TDP (175W vs 240W)

Score

Benchmark

FP32 (float)

Radeon HD 2900 XTX

0.476 TFLOPS

Radeon HD 6870 1600SP Edition +471%

2.72 TFLOPS

Radeon HD 2900 XTX

VS

Radeon HD 6870 1600SP Edition

Graphics Card

Unknown

Release Date

Jan 2013

Radeon R600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

828 MHz

Memory Clock

1050 MHz

Memory

512MB

Memory Size

1024MB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

256bit

106.0GB/s

Bandwidth

134.4GB/s

Render Config

4

Compute Units

20

-

320

Shading Units

1600

16

TMUs

80

16

ROPs

32

-

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

11.89 GPixel/s

Pixel Rate

27.20 GPixel/s

11.89 GTexel/s

Texture Rate

68.00 GTexel/s

-

475.5 GFLOPS

FP32 (float)

2.720 TFLOPS

-

FP64 (double)

544.0 GFLOPS

Board Design

240W

TDP

175W

550 W

Suggested PSU

450 W

2x DVI 1x S-Video

Outputs

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

2x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

R600

GPU Name

Cypress

R600 XTX A11 (215RGMDKA11FG)

GPU Variant

Cypress XT (215-0735033)

TeraScale

Architecture

TeraScale 2

TSMC

Foundry

TSMC

80 nm

Process Size

40 nm

0.72 billion

Transistors

2.154 billion

420 mm²

Die Size

334 mm²

Graphics Features

10.0 (10_0)

DirectX

11.2 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.4

N/A

OpenCL

1.2

N/A

Vulkan

N/A

-

4.0

Shader Model

5.0

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