AMD Radeon Pro 555X vs ATI Mobility Radeon HD 3870 X2

VS

AMD Radeon Pro 555X

ATI Mobility Radeon HD 3870 X2

We compared two Mobile platform GPUs: 4GB VRAM Radeon Pro 555X and 512MB VRAM Mobility Radeon HD 3870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon Pro 555X 's Advantages

Released 9 years and 10 months late

More VRAM (4GB vs 512GB)

Larger VRAM bandwidth (94.08GB/s vs 54.40GB/s)

448 additional rendering cores

Lower TDP (75W vs 110W)

Score

Benchmark

FP32 (float)

Radeon Pro 555X +230%

1.393 TFLOPS

Mobility Radeon HD 3870 X2

0.422 TFLOPS

Radeon Pro 555X

VS

Mobility Radeon HD 3870 X2

Graphics Card

Jul 2018

Release Date

Sep 2008

Radeon Pro Mac

Generation

M8x

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1470 MHz

Memory Clock

850 MHz

Memory

4GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

128bit

Memory Bus

256bit

94.08GB/s

Bandwidth

54.40GB/s

Render Config

12

Compute Units

4

-

768

Shading Units

320

48

TMUs

16

ROPs

16

-

16 KB (per CU)

L1 Cache

-

1024 KB

L2 Cache

256 KB

-

Theoretical Performance

14.51 GPixel/s

Pixel Rate

10.56 GPixel/s

43.54 GTexel/s

Texture Rate

10.56 GTexel/s

1393 GFLOPS

FP16 (half)

-

1393 GFLOPS

FP32 (float)

422.4 GFLOPS

87.07 GFLOPS

FP64 (double)

84.48 GFLOPS

Board Design

75W

TDP

110W

-

No outputs

Outputs

No outputs

None

Power Connectors

-

Graphics Processor

Polaris 21

GPU Name

M88

Polaris 21 PRO

GPU Variant

-

GCN 4.0

Architecture

TeraScale

GlobalFoundries

Foundry

TSMC

14 nm

Process Size

55 nm

3 billion

Transistors

0.666 billion

123 mm²

Die Size

192 mm²

Graphics Features

12 (12_0)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

2.1

OpenCL

N/A

1.2

Vulkan

N/A

-

6.4

Shader Model

4.1

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