ATI Mobility Radeon HD 3870 vs AMD Radeon R5 A255

VS

ATI Mobility Radeon HD 3870

AMD Radeon R5 A255

We compared two Mobile platform GPUs: 512MB VRAM Mobility Radeon HD 3870 and 1024MB VRAM Radeon R5 A255 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R5 A255 's Advantages

Released 5 years and 7 months late

Boost Clock940MHz

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (64.00GB/s vs 54.40GB/s)

64 additional rendering cores

Score

Benchmark

FP32 (float)

Mobility Radeon HD 3870

0.422 TFLOPS

Radeon R5 A255 +70%

0.721 TFLOPS

Mobility Radeon HD 3870

VS

Radeon R5 A255

Graphics Card

Jun 2008

Release Date

Jan 2014

M8x

Generation

All-In-One

Mobile

Type

Mobile

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x8

Clock Speeds

-

Base Clock

925 MHz

-

Boost Clock

940 MHz

850 MHz

Memory Clock

1000 MHz

Memory

512MB

Memory Size

1024MB

GDDR3

Memory Type

GDDR5

256bit

Memory Bus

128bit

54.40GB/s

Bandwidth

64.00GB/s

Render Config

4

Compute Units

6

-

320

Shading Units

384

16

TMUs

24

16

ROPs

8

-

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

10.56 GPixel/s

Pixel Rate

7.520 GPixel/s

10.56 GTexel/s

Texture Rate

22.56 GTexel/s

-

422.4 GFLOPS

FP32 (float)

721.9 GFLOPS

84.48 GFLOPS

FP64 (double)

-

Board Design

55W

TDP

Unknown

-

No outputs

Outputs

Portable Device Dependent

-

Graphics Processor

M88

GPU Name

Topaz

-

GPU Variant

Topaz PRO (216-0858030)

TeraScale

Architecture

GCN 3.0

TSMC

Foundry

TSMC

55 nm

Process Size

28 nm

0.666 billion

Transistors

1.55 billion

192 mm²

Die Size

125 mm²

Graphics Features

10.1 (10_1)

DirectX

12 (12_0)

3.3

OpenGL

4.6

N/A

OpenCL

2.1

N/A

Vulkan

1.2.170

-

4.1

Shader Model

6.5

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