AMD Radeon HD 6990 vs ATI Radeon HD 3870

VS

AMD Radeon HD 6990

ATI Radeon HD 3870

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 512MB VRAM Radeon HD 3870 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

Released 3 years and 4 months late

More VRAM (2GB vs 512GB)

Larger VRAM bandwidth (160.0GB/s vs 72.06GB/s)

1216 additional rendering cores

ATI Radeon HD 3870 's Advantages

Lower TDP (106W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +413%

2.55 TFLOPS

Radeon HD 3870

0.497 TFLOPS

Radeon HD 6990

VS

Radeon HD 3870

Graphics Card

Mar 2011

Release Date

Nov 2007

Northern Islands

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1126 MHz

Memory

2GB

Memory Size

512MB

GDDR5

Memory Type

GDDR4

256bit

Memory Bus

256bit

160.0GB/s

Bandwidth

72.06GB/s

Render Config

24

Compute Units

4

-

1536

Shading Units

320

96

TMUs

16

32

ROPs

16

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

256 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

12.43 GPixel/s

79.68 GTexel/s

Texture Rate

12.43 GTexel/s

-

2.550 TFLOPS

FP32 (float)

497.3 GFLOPS

637.4 GFLOPS

FP64 (double)

99.46 GFLOPS

Board Design

375W

TDP

106W

750 W

Suggested PSU

300 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

2x DVI 1x S-Video

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Antilles

GPU Name

RV670

Antilles XT (215-0807027)

GPU Variant

RV670 XT (215-0708005)

TeraScale 3

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

2.64 billion

Transistors

0.666 billion

389 mm²

Die Size

192 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3 (full) 4.0 (partial)

1.2

OpenCL

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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