AMD Radeon R5 A255 vs AMD Radeon HD 7870M

VS

We compared two Mobile platform GPUs: 1024MB VRAM Radeon R5 A255 and 2GB VRAM Radeon HD 7870M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R5 A255 's Advantages

Released 1 years and 9 months late

Boost Clock940MHz

AMD Radeon HD 7870M 's Advantages

More VRAM (2GB vs 1GB)

256 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R5 A255

0.721 TFLOPS

Radeon HD 7870M +42%

1.024 TFLOPS

Radeon R5 A255

VS

Radeon HD 7870M

Graphics Card

Jan 2014

Release Date

Apr 2012

All-In-One

Generation

London

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

PCIe 3.0 x16

Clock Speeds

925 MHz

Base Clock

-

940 MHz

Boost Clock

-

1000 MHz

Memory Clock

1000 MHz

Memory

1024MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

128bit

64.00GB/s

Bandwidth

64.00GB/s

Render Config

-

SM Count

-

6

Compute Units

10

384

Shading Units

640

24

TMUs

40

8

ROPs

16

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

Theoretical Performance

7.520 GPixel/s

Pixel Rate

12.80 GPixel/s

22.56 GTexel/s

Texture Rate

32.00 GTexel/s

-

FP16 (half)

-

721.9 GFLOPS

FP32 (float)

1024 GFLOPS

-

FP64 (double)

64.00 GFLOPS

Graphics Processor

Topaz

GPU Name

Heathrow

Topaz PRO (216-0858030)

GPU Variant

Heathrow XT (216-0835033)

GCN 3.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.55 billion

Transistors

1.5 billion

125 mm²

Die Size

123 mm²

Board Design

Unknown

TDP

45W

-

Suggested PSU

-

Portable Device Dependent

Outputs

No outputs

-

Power Connectors

-

Graphics Features

12 (12_0)

DirectX

12 (11_1)

4.6

OpenGL

4.6

2.1

OpenCL

1.2

1.2.170

Vulkan

1.2

-

CUDA

-

6.5

Shader Model

5.1

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