AMD Radeon Sky 900 vs AMD Radeon HD 7970 X2

VS

AMD Radeon Sky 900

AMD Radeon HD 7970 X2

We compared two Desktop platform GPUs: 3GB VRAM Radeon Sky 900 and 3GB VRAM Radeon HD 7970 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon Sky 900 's Advantages

Released 7 months late

Boost Clock950MHz

Lower TDP (300W vs 500W)

AMD Radeon HD 7970 X2 's Advantages

Larger VRAM bandwidth (264.0GB/s vs 240.0GB/s)

256 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon Sky 900

3.405 TFLOPS

Radeon HD 7970 X2 +11%

3.789 TFLOPS

Radeon Sky 900

VS

Radeon HD 7970 X2

Graphics Card

Mar 2013

Release Date

Aug 2012

Radeon Sky

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

825 MHz

Base Clock

-

950 MHz

Boost Clock

-

1250 MHz

Memory Clock

1375 MHz

Memory

3GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

384bit

240.0GB/s

Bandwidth

264.0GB/s

Render Config

28

Compute Units

32

-

1792

Shading Units

2048

112

TMUs

128

32

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

768 KB

-

Theoretical Performance

30.40 GPixel/s

Pixel Rate

29.60 GPixel/s

106.4 GTexel/s

Texture Rate

118.4 GTexel/s

-

3.405 TFLOPS

FP32 (float)

3.789 TFLOPS

851.2 GFLOPS

FP64 (double)

947.2 GFLOPS

Board Design

300W

TDP

500W

700 W

Suggested PSU

900 W

1x DVI 1x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

3x 8-pin

Graphics Processor

Tahiti

GPU Name

New Zealand

Orthrus

GPU Variant

-

GCN 1.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

4.313 billion

352 mm²

Die Size

352 mm²

Graphics Features

12 (11_1)

DirectX

12 (11_1)

4.6

OpenGL

4.6

1.2

OpenCL

1.2

Vulkan

1.2

-

5.1

Shader Model

5.1

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