AMD Radeon Sky 900 vs AMD Radeon HD 7990

VS

AMD Radeon Sky 900

AMD Radeon HD 7990

We compared two Desktop platform GPUs: 3GB VRAM Radeon Sky 900 and 3GB VRAM Radeon HD 7990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon Sky 900 's Advantages

Lower TDP (300W vs 375W)

AMD Radeon HD 7990 's Advantages

Boost Clock has increased by 5% (1000MHz vs 950MHz)

Larger VRAM bandwidth (288.0GB/s vs 240.0GB/s)

256 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon Sky 900

3.405 TFLOPS

Radeon HD 7990 +20%

4.096 TFLOPS

Radeon Sky 900

VS

Radeon HD 7990

Graphics Card

Mar 2013

Release Date

Apr 2013

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

1000 MHz

1250 MHz

Memory Clock

1500 MHz

Memory

3GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

384bit

240.0GB/s

Bandwidth

288.0GB/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

32.00 GPixel/s

106.4 GTexel/s

Texture Rate

128.0 GTexel/s

-

3.405 TFLOPS

FP32 (float)

4.096 TFLOPS

851.2 GFLOPS

FP64 (double)

1024 GFLOPS

Board Design

300W

TDP

375W

700 W

Suggested PSU

750 W

1x DVI 1x mini-DisplayPort 1.2

Outputs

1x DVI 4x mini-DisplayPort 1.2

2x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Tahiti

GPU Name

Malta

Orthrus

GPU Variant

Malta XT (215-0849026)

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

365 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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