NVIDIA GeForce GTX 660 Rev. 2 vs AMD Radeon HD 6850 X2

VS

NVIDIA GeForce GTX 660 Rev. 2

AMD Radeon HD 6850 X2

We compared two Desktop platform GPUs: 2GB VRAM GeForce GTX 660 Rev. 2 and 2GB VRAM Radeon HD 6850 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GTX 660 Rev. 2 's Advantages

Released 3 years late

Boost Clock1032MHz

Larger VRAM bandwidth (144.2GB/s vs 134.4GB/s)

Lower TDP (140W vs 254W)

Score

Benchmark

FP32 (float)

GeForce GTX 660 Rev. 2 +28%

1.981 TFLOPS

Radeon HD 6850 X2

1.536 TFLOPS

GeForce GTX 660 Rev. 2

VS

Radeon HD 6850 X2

Graphics Card

Sep 2014

Release Date

Sep 2011

GeForce 600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

980 MHz

Base Clock

-

1032 MHz

Boost Clock

-

1502 MHz

Memory Clock

1050 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

256bit

144.2GB/s

Bandwidth

134.4GB/s

Render Config

-

Compute Units

12

-

960

Shading Units

960

80

TMUs

48

24

ROPs

32

-

16 KB (per SMX)

L1 Cache

8 KB (per CU)

384 KB

L2 Cache

512 KB

-

Theoretical Performance

20.64 GPixel/s

Pixel Rate

25.60 GPixel/s

82.56 GTexel/s

Texture Rate

38.40 GTexel/s

-

1.981 TFLOPS

FP32 (float)

1.536 TFLOPS

82.56 GFLOPS

FP64 (double)

-

Board Design

140W

TDP

254W

300 W

Suggested PSU

600 W

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

Outputs

2x DVI 1x HDMI 1.3a 1x DisplayPort 1.1

1x 6-pin

Power Connectors

2x 8-pin

Graphics Processor

GK104

GPU Name

Barts

-

GPU Variant

Barts PRO (215-0798006)

Kepler

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

3.54 billion

Transistors

1.7 billion

294 mm²

Die Size

255 mm²

Graphics Features

12 (11_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

3.0

OpenCL

1.2

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

5.0

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