NVIDIA GeForce GTX 660 vs AMD Radeon HD 7950

VS

NVIDIA GeForce GTX 660

AMD Radeon HD 7950

We compared two Desktop platform GPUs: 2GB VRAM GeForce GTX 660 and 3GB VRAM Radeon HD 7950 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GTX 660 's Advantages

Released 8 months late

Boost Clock1032MHz

Lower TDP (140W vs 200W)

AMD Radeon HD 7950 's Advantages

More VRAM (3GB vs 2GB)

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

832 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GTX 660

1.981 TFLOPS

Radeon HD 7950 +44%

2.867 TFLOPS

3DMark Time Spy

GeForce GTX 660

1308

Radeon HD 7950 +46%

1917

GeForce GTX 660

VS

Radeon HD 7950

Graphics Card

Sep 2012

Release Date

Jan 2012

GeForce 600

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

980 MHz

Base Clock

-

1032 MHz

Boost Clock

-

1502 MHz

Memory Clock

1250 MHz

Memory

2GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

384bit

144.2GB/s

Bandwidth

240.0GB/s

Render Config

-

Compute Units

28

-

960

Shading Units

1792

80

TMUs

112

24

ROPs

32

-

16 KB (per SMX)

L1 Cache

16 KB (per CU)

384 KB

L2 Cache

768 KB

-

Theoretical Performance

20.64 GPixel/s

Pixel Rate

25.60 GPixel/s

82.56 GTexel/s

Texture Rate

89.60 GTexel/s

-

1.981 TFLOPS

FP32 (float)

2.867 TFLOPS

82.56 GFLOPS

FP64 (double)

716.8 GFLOPS

Board Design

140W

TDP

200W

300 W

Suggested PSU

550 W

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

Outputs

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

1x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

GK106

GPU Name

Tahiti

GK106-400-A1

GPU Variant

Tahiti PRO (215-0821056)

Kepler

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

2.54 billion

Transistors

4.313 billion

221 mm²

Die Size

352 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_1)

4.6

OpenGL

4.6

3.0

OpenCL

1.2

1.1

Vulkan

1.2

3.0

CUDA

-

5.1

Shader Model

5.1

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