AMD Radeon HD 6990 vs ATI Radeon HD 4870 X2

VS

AMD Radeon HD 6990

ATI Radeon HD 4870 X2

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 1024MB VRAM Radeon HD 4870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

Released 2 years and 7 months late

More VRAM (2GB vs 1024GB)

Larger VRAM bandwidth (160.0GB/s vs 115.2GB/s)

736 additional rendering cores

ATI Radeon HD 4870 X2 's Advantages

Lower TDP (286W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +112%

2.55 TFLOPS

Radeon HD 4870 X2

1.2 TFLOPS

Radeon HD 6990

VS

Radeon HD 4870 X2

Graphics Card

Mar 2011

Release Date

Aug 2008

Northern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

900 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

160.0GB/s

Bandwidth

115.2GB/s

Render Config

24

Compute Units

10

-

1536

Shading Units

800

96

TMUs

40

32

ROPs

16

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

12.00 GPixel/s

79.68 GTexel/s

Texture Rate

30.00 GTexel/s

-

2.550 TFLOPS

FP32 (float)

1200 GFLOPS

637.4 GFLOPS

FP64 (double)

240.0 GFLOPS

Board Design

375W

TDP

286W

750 W

Suggested PSU

600 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

2x DVI 1x S-Video

2x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Antilles

GPU Name

R700

Antilles XT (215-0807027)

GPU Variant

R700 XT (215-0669045)

TeraScale 3

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

2.64 billion

Transistors

0.956 billion

389 mm²

Die Size

256 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

1.1

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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