AMD Radeon HD 6990 vs AMD Radeon HD 7970

VS

AMD Radeon HD 6990

AMD Radeon HD 7970

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 3GB VRAM Radeon HD 7970 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7970 's Advantages

Released 9 months late

More VRAM (3GB vs 2GB)

Larger VRAM bandwidth (264.0GB/s vs 160.0GB/s)

512 additional rendering cores

Lower TDP (250W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990

2.55 TFLOPS

Radeon HD 7970 +48%

3.789 TFLOPS

Radeon HD 6990

VS

Radeon HD 7970

Graphics Card

Mar 2011

Release Date

Dec 2011

Northern Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1375 MHz

Memory

2GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

384bit

160.0GB/s

Bandwidth

264.0GB/s

Render Config

24

Compute Units

32

-

1536

Shading Units

2048

96

TMUs

128

32

ROPs

32

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

768 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

29.60 GPixel/s

79.68 GTexel/s

Texture Rate

118.4 GTexel/s

-

2.550 TFLOPS

FP32 (float)

3.789 TFLOPS

637.4 GFLOPS

FP64 (double)

947.2 GFLOPS

Board Design

375W

TDP

250W

750 W

Suggested PSU

600 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

2x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Antilles

GPU Name

Tahiti

Antilles XT (215-0807027)

GPU Variant

Tahiti XT (215-0821060)

TeraScale 3

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

4.313 billion

389 mm²

Die Size

352 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (11_1)

4.4

OpenGL

4.6

1.2

OpenCL

1.2

N/A

Vulkan

1.2

-

5.0

Shader Model

5.1

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