NVIDIA GeForce GT 640 OEM Rebrand vs NVIDIA T400

VS

NVIDIA GeForce GT 640 OEM Rebrand

NVIDIA T400

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GT 640 OEM Rebrand and 2GB VRAM T400 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA T400 's Advantages

Released 9 years and 1 months late

Boost Clock1425MHz

More VRAM (2GB vs 1536GB)

Larger VRAM bandwidth (80.00GB/s vs 38.40GB/s)

240 additional rendering cores

Lower TDP (30W vs 75W)

Score

Benchmark

FP32 (float)

GeForce GT 640 OEM Rebrand

0.415 TFLOPS

T400 +163%

1.094 TFLOPS

GeForce GT 640 OEM Rebrand

VS

T400

Graphics Card

Apr 2012

Release Date

May 2021

GeForce 600

Generation

Quadro

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

420 MHz

-

Boost Clock

1425 MHz

800 MHz

Memory Clock

1250 MHz

Memory

1536MB

Memory Size

2GB

DDR3

Memory Type

GDDR6

192bit

Memory Bus

64bit

38.40GB/s

Bandwidth

80.00GB/s

Render Config

-

3

SM Count

6

144

Shading Units

384

24

TMUs

24

ROPs

16

-

64 KB (per SM)

L1 Cache

64 KB (per SM)

384 KB

L2 Cache

1024 KB

-

Theoretical Performance

4.320 GPixel/s

Pixel Rate

22.80 GPixel/s

17.28 GTexel/s

Texture Rate

34.20 GTexel/s

-

FP16 (half)

2.189 TFLOPS

414.7 GFLOPS

FP32 (float)

1094 GFLOPS

34.56 GFLOPS

FP64 (double)

34.20 GFLOPS

Board Design

75W

TDP

30W

250 W

Suggested PSU

200 W

2x DVI 1x mini-HDMI 1.3a

Outputs

3x mini-DisplayPort 1.4a

None

Power Connectors

None

Graphics Processor

GF116

GPU Name

TU117

GF116-150-A1

GPU Variant

-

Fermi 2.0

Architecture

Turing

TSMC

Foundry

TSMC

40 nm

Process Size

12 nm

1.17 billion

Transistors

4.7 billion

238 mm²

Die Size

200 mm²

Graphics Features

12 (11_0)

DirectX

12 (12_1)

4.6

OpenGL

4.6

1.1

OpenCL

3.0

N/A

Vulkan

1.3

2.1

CUDA

7.5

5.1

Shader Model

6.6

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