AMD Radeon RX 640 Mobile vs ATI Mobility Radeon HD 3870

VS

AMD Radeon RX 640 Mobile

ATI Mobility Radeon HD 3870

We compared two Mobile platform GPUs: 2GB VRAM Radeon RX 640 Mobile and 512MB VRAM Mobility Radeon HD 3870 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 640 Mobile 's Advantages

Released 10 years and 11 months late

Boost Clock1218MHz

More VRAM (2GB vs 512GB)

320 additional rendering cores

Lower TDP (50W vs 55W)

ATI Mobility Radeon HD 3870 's Advantages

Larger VRAM bandwidth (54.40GB/s vs 48.00GB/s)

Score

Benchmark

FP32 (float)

Radeon RX 640 Mobile +269%

1.559 TFLOPS

Mobility Radeon HD 3870

0.422 TFLOPS

Radeon RX 640 Mobile

VS

Mobility Radeon HD 3870

Graphics Card

May 2019

Release Date

Jun 2008

Mobility Radeon

Generation

M8x

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

PCIe 2.0 x16

Clock Speeds

1082 MHz

Base Clock

-

1218 MHz

Boost Clock

-

1500 MHz

Memory Clock

850 MHz

Memory

2GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

64bit

Memory Bus

256bit

48.00GB/s

Bandwidth

54.40GB/s

Render Config

10

Compute Units

4

-

640

Shading Units

320

40

TMUs

16

ROPs

16

-

16 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

256 KB

-

Theoretical Performance

19.49 GPixel/s

Pixel Rate

10.56 GPixel/s

48.72 GTexel/s

Texture Rate

10.56 GTexel/s

1.559 TFLOPS

FP16 (half)

-

1.559 TFLOPS

FP32 (float)

422.4 GFLOPS

97.44 GFLOPS

FP64 (double)

84.48 GFLOPS

Board Design

50W

TDP

55W

-

No outputs

Outputs

No outputs

None

Power Connectors

-

Graphics Processor

Polaris 23

GPU Name

M88

Polaris 23 XT

GPU Variant

-

GCN 4.0

Architecture

TeraScale

GlobalFoundries

Foundry

TSMC

14 nm

Process Size

55 nm

2.2 billion

Transistors

0.666 billion

103 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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