ATI Radeon HD 4870 X2 vs AMD Radeon HD 6990

VS

ATI Radeon HD 4870 X2

AMD Radeon HD 6990

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

Main Differences

ATI Radeon HD 4870 X2 's Advantages

Lower TDP (286W vs 375W)

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

Score

Benchmark

FP32 (float)

Radeon HD 4870 X2

1.2 TFLOPS

Radeon HD 6990 +112%

2.55 TFLOPS

Radeon HD 4870 X2

VS

Radeon HD 6990

Graphics Card

Aug 2008

Release Date

Mar 2011

Radeon R700

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

900 MHz

Memory Clock

1250 MHz

Memory

1024MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

115.2GB/s

Bandwidth

160.0GB/s

Render Config

10

Compute Units

24

-

800

Shading Units

1536

40

TMUs

96

16

ROPs

32

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

12.00 GPixel/s

Pixel Rate

26.56 GPixel/s

30.00 GTexel/s

Texture Rate

79.68 GTexel/s

-

1200 GFLOPS

FP32 (float)

2.550 TFLOPS

240.0 GFLOPS

FP64 (double)

637.4 GFLOPS

Board Design

286W

TDP

375W

600 W

Suggested PSU

750 W

2x DVI 1x S-Video

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 6-pin + 1x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

R700

GPU Name

Antilles

R700 XT (215-0669045)

GPU Variant

Antilles XT (215-0807027)

TeraScale

Architecture

TeraScale 3

TSMC

Foundry

TSMC

55 nm

Process Size

40 nm

0.956 billion

Transistors

2.64 billion

256 mm²

Die Size

389 mm²

Graphics Features

10.1 (10_1)

DirectX

11.2 (11_0)

3.3

OpenGL

4.4

1.1

OpenCL

1.2

N/A

Vulkan

N/A

-

4.1

Shader Model

5.0

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