NVIDIA GeForce GT 640 OEM Rebrand vs NVIDIA RTX A400

VS

NVIDIA GeForce GT 640 OEM Rebrand

NVIDIA RTX A400

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GT 640 OEM Rebrand and 4GB VRAM RTX A400 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA RTX A400 's Advantages

Released 12 years late

Boost Clock1762MHz

More VRAM (4GB vs 1536GB)

Larger VRAM bandwidth (96.00GB/s vs 38.40GB/s)

624 additional rendering cores

Lower TDP (50W vs 75W)

Score

Benchmark

FP32 (float)

GeForce GT 640 OEM Rebrand

0.415 TFLOPS

RTX A400 +552%

2.706 TFLOPS

GeForce GT 640 OEM Rebrand

VS

RTX A400

Graphics Card

Apr 2012

Release Date

Apr 2024

GeForce 600

Generation

Quadro Ampere(Ax000)

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 4.0 x8

Clock Speeds

-

Base Clock

1417 MHz

-

Boost Clock

1762 MHz

800 MHz

Memory Clock

1500 MHz

Memory

1536MB

Memory Size

4GB

DDR3

Memory Type

GDDR6

192bit

Memory Bus

64bit

38.40GB/s

Bandwidth

96.00GB/s

Render Config

-

3

SM Count

6

144

Shading Units

768

24

TMUs

24

ROPs

16

-

Tensor Cores

24

-

RT Cores

6

64 KB (per SM)

L1 Cache

128 KB (per SM)

384 KB

L2 Cache

2 MB

-

Theoretical Performance

4.320 GPixel/s

Pixel Rate

28.19 GPixel/s

17.28 GTexel/s

Texture Rate

42.29 GTexel/s

-

FP16 (half)

2.706 TFLOPS

414.7 GFLOPS

FP32 (float)

2.706 TFLOPS

34.56 GFLOPS

FP64 (double)

42.29 GFLOPS

Board Design

75W

TDP

50W

250 W

Suggested PSU

250 W

2x DVI 1x mini-HDMI 1.3a

Outputs

4x mini-DisplayPort 1.4a

None

Power Connectors

None

Graphics Processor

GF116

GPU Name

GA107

GF116-150-A1

GPU Variant

-

Fermi 2.0

Architecture

Ampere

TSMC

Foundry

Samsung

40 nm

Process Size

8 nm

1.17 billion

Transistors

8.7 billion

238 mm²

Die Size

200 mm²

Graphics Features

12 (11_0)

DirectX

12 Ultimate (12_2)

4.6

OpenGL

4.6

1.1

OpenCL

3.0

N/A

Vulkan

1.3

2.1

CUDA

8.6

5.1

Shader Model

6.8

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