GeForce GTX 850A and Radeon HD 4870 Mac Edition - video card comparison

GeForce GTX 850A

Radeon HD 4870 Mac Edition

Architecture

Maxwell (2014−2018)

TeraScale (2005−2013)

GPU code name

GM107

RV770

Market segment

Desktop

Release date

March 2014

January 2009

Interface

PCIe 3.0 x16

PCIe 2.0 x16

Supplementary power connectors

2x 6-pin

Boost clock speed

936 MHz

Core clock speed

902 MHz

750 MHz

Floating-point performance

1,198 gflops

1,200.0 gflops

Manufacturing process technology

28 nm

55 nm

Number of transistors

1,870 million

956 million

Pipelines / CUDA cores

640

800

Power consumption (TDP)

45 Watt

150 Watt

Texture fill rate

37.44

30.00

Memory type

DDR3

GDDR5

Maximum RAM amount

2 GB

512 MB

Memory bus width

128 Bit

256 Bit

Memory clock speed

1800 MHz

3400 MHz

Memory bandwidth

28.8 GB/s

108.8 GB/s

Display Connectors

No outputs

1x DVI, 1x mini-DisplayPort

DirectX

12 (11_0)

10.1 (10_1)

CUDA

5.0

OpenCL

1.2

1.1

OpenGL

4.6

3.3

Shader Model

5.1

4.1

Vulkan

1.1.126

N/A