AMD Radeon HD 8870M vs AMD Radeon R9 M390X

VS

AMD Radeon HD 8870M

AMD Radeon R9 M390X

We compared two Mobile platform GPUs: 2GB VRAM Radeon HD 8870M and 4GB VRAM Radeon R9 M390X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 8870M 's Advantages

Boost Clock775MHz

AMD Radeon R9 M390X 's Advantages

Released 2 years and 1 months late

More VRAM (4GB vs 2GB)

Larger VRAM bandwidth (160.0GB/s vs 72.00GB/s)

1408 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 8870M

0.992 TFLOPS

Radeon R9 M390X +198%

2.961 TFLOPS

Radeon HD 8870M

VS

Radeon R9 M390X

Graphics Card

Apr 2013

Release Date

May 2015

Solar System

Generation

Crystal System

Mobile

Type

Mobile

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

725 MHz

Base Clock

-

775 MHz

Boost Clock

-

1125 MHz

Memory Clock

1250 MHz

Memory

2GB

Memory Size

4GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

256bit

72.00GB/s

Bandwidth

160.0GB/s

Render Config

10

Compute Units

32

-

640

Shading Units

2048

40

TMUs

128

16

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

12.40 GPixel/s

Pixel Rate

23.14 GPixel/s

31.00 GTexel/s

Texture Rate

92.54 GTexel/s

-

FP16 (half)

2.961 TFLOPS

992.0 GFLOPS

FP32 (float)

2.961 TFLOPS

62.00 GFLOPS

FP64 (double)

185.1 GFLOPS

Board Design

Unknown

TDP

75W

-

Portable Device Dependent

Outputs

No outputs

-

Power Connectors

None

Graphics Processor

Venus

GPU Name

Amethyst

Venus XT (216-0846000)

GPU Variant

Amethyst XT

GCN 1.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.5 billion

Transistors

5 billion

123 mm²

Die Size

366 mm²

Graphics Features

12 (11_1)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.1 (1.2)

OpenCL

2.0

1.2.170

Vulkan

1.2

-

6.5 (5.1)

Shader Model

6.3

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