AMD Radeon RX 6600S vs AMD Radeon R9 M390X

VS

AMD Radeon RX 6600S

AMD Radeon R9 M390X

We compared two Mobile platform GPUs: 4GB VRAM Radeon RX 6600S 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 RX 6600S 's Advantages

Released 6 years and 8 months late

Boost Clock2000MHz

Larger VRAM bandwidth (224.0GB/s vs 160.0GB/s)

AMD Radeon R9 M390X 's Advantages

256 additional rendering cores

Lower TDP (75W vs 80W)

Score

Benchmark

FP32 (float)

Radeon RX 6600S +142%

7.168 TFLOPS

Radeon R9 M390X

2.961 TFLOPS

Radeon RX 6600S

VS

Radeon R9 M390X

Graphics Card

Jan 2022

Release Date

May 2015

Mobility Radeon

Generation

Crystal System

Mobile

Type

Mobile

PCIe 4.0 x8

Bus Interface

PCIe 3.0 x16

Clock Speeds

1700 MHz

Base Clock

-

2000 MHz

Boost Clock

-

1750 MHz

Memory Clock

1250 MHz

Memory

4GB

Memory Size

4GB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

256bit

224.0GB/s

Bandwidth

160.0GB/s

Render Config

28

Compute Units

32

-

1792

Shading Units

2048

112

TMUs

128

64

ROPs

32

-

28

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

2 MB

L2 Cache

512 KB

32 MB

L3 Cache

-

Theoretical Performance

128.0 GPixel/s

Pixel Rate

23.14 GPixel/s

224.0 GTexel/s

Texture Rate

92.54 GTexel/s

14.34 TFLOPS

FP16 (half)

2.961 TFLOPS

7.168 TFLOPS

FP32 (float)

2.961 TFLOPS

448.0 GFLOPS

FP64 (double)

185.1 GFLOPS

Board Design

80W

TDP

75W

-

No outputs

Outputs

No outputs

None

Power Connectors

None

Graphics Processor

Navi 23

GPU Name

Amethyst

-

GPU Variant

Amethyst XT

RDNA 2.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

11.06 billion

Transistors

5 billion

237 mm²

Die Size

366 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.1

OpenCL

2.0

1.3

Vulkan

1.2

-

6.5

Shader Model

6.3

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