GeForce GTX 660 OEM and Radeon HD 3850 - video card comparison

GeForce GTX 660 OEM

Radeon HD 3850

Architecture

Kepler (2012−2018)

TeraScale (2005−2013)

GPU code name

GK104

RV670

Market segment

Desktop

Release date

August 2012

November 2007

Interface

PCIe 3.0 x16

PCIe 2.0 x16

Supplementary power connectors

1x 6-pin

Boost clock speed

888 MHz

Core clock speed

823 MHz

668 MHz

Floating-point performance

2,046 gflops

427.5 gflops

Manufacturing process technology

28 nm

55 nm

Number of transistors

3,540 million

666 million

Pipelines / CUDA cores

1152

320

Power consumption (TDP)

130 Watt

75 Watt

Texture fill rate

85.25

10.69

Memory type

GDDR5

GDDR3

Maximum RAM amount

2 GB

1 GB

Memory bus width

256 Bit

Memory clock speed

5600 MHz

1660 MHz

Memory bandwidth

179.2 GB/s

53.12 GB/s

Display Connectors

2x DVI, 1x HDMI, 1x DisplayPort

2x DVI, 1x S-Video

HDMI

DirectX

12 (11_0)

10.1 (10_1)

CUDA

3.0

OpenCL

1.2

N/A

OpenGL

4.6

3.3

Shader Model

5.1

4.1

Vulkan

1.1.126

N/A