AMD Radeon HD 6990 vs AMD Radeon HD 6850

VS

AMD Radeon HD 6990

AMD Radeon HD 6850

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 1024MB VRAM Radeon HD 6850 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

More VRAM (2GB vs 1024GB)

Larger VRAM bandwidth (160.0GB/s vs 128.0GB/s)

576 additional rendering cores

AMD Radeon HD 6850 's Advantages

Lower TDP (127W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +71%

2.55 TFLOPS

Radeon HD 6850

1.488 TFLOPS

Radeon HD 6990

VS

Radeon HD 6850

Graphics Card

Mar 2011

Release Date

Oct 2010

Northern Islands

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1000 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

160.0GB/s

Bandwidth

128.0GB/s

Render Config

24

Compute Units

12

-

1536

Shading Units

960

96

TMUs

48

32

ROPs

32

-

8 KB (per CU)

L1 Cache

8 KB (per CU)

512 KB

L2 Cache

512 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

24.80 GPixel/s

79.68 GTexel/s

Texture Rate

37.20 GTexel/s

-

2.550 TFLOPS

FP32 (float)

1488 GFLOPS

637.4 GFLOPS

FP64 (double)

-

Board Design

375W

TDP

127W

750 W

Suggested PSU

300 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Antilles

GPU Name

Barts

Antilles XT (215-0807027)

GPU Variant

Barts PRO (215-0798006)

TeraScale 3

Architecture

TeraScale 2

TSMC

Foundry

TSMC

40 nm

Process Size

40 nm

2.64 billion

Transistors

1.7 billion

389 mm²

Die Size

255 mm²

Graphics Features

11.2 (11_0)

DirectX

11.2 (11_0)

4.4

OpenGL

4.4

1.2

OpenCL

1.2

N/A

Vulkan

N/A

-

5.0

Shader Model

5.0

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