AMD Radeon RX 7900M vs AMD Radeon R9 M390X

VS

We compared two Mobile platform GPUs: 16GB VRAM Radeon RX 7900M 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 7900M 's Advantages

Released 8 years and 5 months late

Boost Clock2090MHz

More VRAM (16GB vs 4GB)

Larger VRAM bandwidth (576.0GB/s vs 160.0GB/s)

2560 additional rendering cores

AMD Radeon R9 M390X 's Advantages

Lower TDP (75W vs 180W)

Score

Benchmark

FP32 (float)

Radeon RX 7900M +1200%

38.52 TFLOPS

Radeon R9 M390X

2.961 TFLOPS

Radeon RX 7900M

VS

Radeon R9 M390X

Graphics Card

Oct 2023

Release Date

May 2015

Navi Mobile

Generation

Crystal System

Mobile

Type

Mobile

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1825 MHz

Base Clock

-

2090 MHz

Boost Clock

-

2250 MHz

Memory Clock

1250 MHz

Memory

16GB

Memory Size

4GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

256bit

576.0GB/s

Bandwidth

160.0GB/s

Render Config

-

SM Count

-

72

Compute Units

32

4608

Shading Units

2048

288

TMUs

128

192

ROPs

32

-

Tensor Cores

-

72

RT Cores

-

256 KB per Array

L1 Cache

16 KB (per CU)

6 MB

L2 Cache

512 KB

Theoretical Performance

401.3 GPixel/s

Pixel Rate

23.14 GPixel/s

601.9 GTexel/s

Texture Rate

92.54 GTexel/s

77.05 TFLOPS

FP16 (half)

2.961 TFLOPS

38.52 TFLOPS

FP32 (float)

2.961 TFLOPS

1204 GFLOPS

FP64 (double)

185.1 GFLOPS

Graphics Processor

Navi 31

GPU Name

Amethyst

Navi 31

GPU Variant

Amethyst XT

RDNA 3.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

5 nm

Process Size

28 nm

57.7 billion

Transistors

5 billion

529 mm²

Die Size

366 mm²

Board Design

180W

TDP

75W

-

Suggested PSU

-

Portable Device Dependent

Outputs

No outputs

None

Power Connectors

None

Graphics Features

12 Ultimate (12_2)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.2

OpenCL

2.0

1.3

Vulkan

1.2

-

CUDA

-

6.7

Shader Model

6.3

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