AMD Radeon HD 7970 vs AMD Radeon HD 6990

VS

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 and 2GB VRAM Radeon HD 6990 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 7970 +48%

3.789 TFLOPS

Radeon HD 6990

2.55 TFLOPS

Radeon HD 7970

VS

Radeon HD 6990

Graphics Card

Dec 2011

Release Date

Mar 2011

Southern Islands

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

1375 MHz

Memory Clock

1250 MHz

Memory

3GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

264.0GB/s

Bandwidth

160.0GB/s

Render Config

-

SM Count

-

32

Compute Units

24

2048

Shading Units

1536

128

TMUs

96

32

ROPs

32

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

768 KB

L2 Cache

512 KB

Theoretical Performance

29.60 GPixel/s

Pixel Rate

26.56 GPixel/s

118.4 GTexel/s

Texture Rate

79.68 GTexel/s

-

FP16 (half)

-

3.789 TFLOPS

FP32 (float)

2.550 TFLOPS

947.2 GFLOPS

FP64 (double)

637.4 GFLOPS

Graphics Processor

Tahiti

GPU Name

Antilles

Tahiti XT (215-0821060)

GPU Variant

Antilles XT (215-0807027)

GCN 1.0

Architecture

TeraScale 3

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

4.313 billion

Transistors

2.64 billion

352 mm²

Die Size

389 mm²

Board Design

250W

TDP

375W

600 W

Suggested PSU

750 W

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

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 6-pin + 1x 8-pin

Power Connectors

2x 8-pin

Graphics Features

12 (11_1)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

1.2

OpenCL

1.2

Vulkan

N/A

-

CUDA

-

5.1

Shader Model

5.0

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