AMD Radeon Sky 900 vs NVIDIA GeForce GTX 660 Rev. 2

VS

AMD Radeon Sky 900

NVIDIA GeForce GTX 660 Rev. 2

We compared two Desktop platform GPUs: 3GB VRAM Radeon Sky 900 and 2GB VRAM GeForce GTX 660 Rev. 2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon Sky 900 's Advantages

More VRAM (3GB vs 2GB)

Larger VRAM bandwidth (240.0GB/s vs 144.2GB/s)

832 additional rendering cores

NVIDIA GeForce GTX 660 Rev. 2 's Advantages

Released 1 years and 6 months late

Boost Clock has increased by 9% (1032MHz vs 950MHz)

Lower TDP (140W vs 300W)

Score

Benchmark

FP32 (float)

Radeon Sky 900 +71%

3.405 TFLOPS

GeForce GTX 660 Rev. 2

1.981 TFLOPS

Radeon Sky 900

VS

GeForce GTX 660 Rev. 2

Graphics Card

Mar 2013

Release Date

Sep 2014

Radeon Sky

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

825 MHz

Base Clock

980 MHz

950 MHz

Boost Clock

1032 MHz

1250 MHz

Memory Clock

1502 MHz

Memory

3GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

192bit

240.0GB/s

Bandwidth

144.2GB/s

Render Config

28

Compute Units

-

1792

Shading Units

960

112

TMUs

80

32

ROPs

24

-

16 KB (per CU)

L1 Cache

16 KB (per SMX)

768 KB

L2 Cache

384 KB

-

Theoretical Performance

30.40 GPixel/s

Pixel Rate

20.64 GPixel/s

106.4 GTexel/s

Texture Rate

82.56 GTexel/s

-

3.405 TFLOPS

FP32 (float)

1.981 TFLOPS

851.2 GFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

300W

TDP

140W

700 W

Suggested PSU

300 W

1x DVI 1x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Tahiti

GPU Name

GK104

Orthrus

GPU Variant

-

GCN 1.0

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

3.54 billion

352 mm²

Die Size

294 mm²

Graphics Features

12 (11_1)

DirectX

12 (11_0)

4.6

OpenGL

4.6

1.2

OpenCL

3.0

1.2

Vulkan

1.1

-

CUDA

3.0

5.1

Shader Model

5.1

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