NVIDIA GeForce RTX 4090 Mobile vs NVIDIA GeForce GT 645M

VS

NVIDIA GeForce RTX 4090 Mobile NVIDIA GeForce GT 645M

We compared two Mobile platform GPUs: 16GB VRAM GeForce RTX 4090 Mobile and 2GB VRAM GeForce GT 645M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce RTX 4090 Mobile 's Advantages

Released 10 years and 3 months late

Boost Clock1695MHz

More VRAM (16GB vs 2GB)

Larger VRAM bandwidth (576.0GB/s vs 28.80GB/s)

9344 additional rendering cores

NVIDIA GeForce GT 645M 's Advantages

Lower TDP (32W vs 120W)

Score

Benchmark

FP32 (float)

GeForce RTX 4090 Mobile +5962%

32.98 TFLOPS

GeForce GT 645M

0.544 TFLOPS

GeForce RTX 4090 Mobile

VS

GeForce GT 645M

Graphics Card

Jan 2023

Release Date

Oct 2012

GeForce 40 Mobile

Generation

GeForce 600M

Mobile

Type

Mobile

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1335 MHz

Base Clock

-

1695 MHz

Boost Clock

-

2250 MHz

Memory Clock

900 MHz

Memory

16GB

Memory Size

2GB

GDDR6

Memory Type

DDR3

256bit

Memory Bus

128bit

576.0GB/s

Bandwidth

28.80GB/s

Render Config

76

SM Count

-

Compute Units

-

9728

Shading Units

384

304

TMUs

32

112

ROPs

16

304

Tensor Cores

-

76

RT Cores

-

128 KB (per SM)

L1 Cache

16 KB (per SMX)

64 MB

L2 Cache

256 KB

Theoretical Performance

189.8 GPixel/s

Pixel Rate

5.672 GPixel/s

515.3 GTexel/s

Texture Rate

22.69 GTexel/s

32.98 TFLOPS

FP16 (half)

-

32.98 TFLOPS

FP32 (float)

544.5 GFLOPS

515.3 GFLOPS

FP64 (double)

22.69 GFLOPS

Graphics Processor

AD103

GPU Name

GK107

GN21-X11

GPU Variant

N13P-GS

Ada Lovelace

Architecture

Kepler

TSMC

Foundry

TSMC

4 nm

Process Size

28 nm

45.9 billion

Transistors

1.27 billion

379 mm²

Die Size

118 mm²

Board Design

120W

TDP

32W

-

Suggested PSU

-

Portable Device Dependent

Outputs

No outputs

None

Power Connectors

-

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_0)

4.6

OpenGL

4.6

3.0

OpenCL

3.0

1.3

Vulkan

1.1

8.9

CUDA

3.0

6.7

Shader Model

5.1

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