NVIDIA GeForce GT 640 OEM Rebrand vs NVIDIA GeForce GT 645 OEM

VS

NVIDIA GeForce GT 640 OEM Rebrand

NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GT 640 OEM Rebrand and 1024MB VRAM GeForce GT 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 OEM Rebrand 's Advantages

More VRAM (1536GB vs 1024GB)

Lower TDP (75W vs 102W)

NVIDIA GeForce GT 645 OEM 's Advantages

Larger VRAM bandwidth (91.87GB/s vs 38.40GB/s)

144 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640 OEM Rebrand

0.415 TFLOPS

GeForce GT 645 OEM +115%

0.894 TFLOPS

GeForce GT 640 OEM Rebrand

VS

GeForce GT 645 OEM

Graphics Card

Apr 2012

Release Date

Apr 2012

GeForce 600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

800 MHz

Memory Clock

957 MHz

Memory

1536MB

Memory Size

1024MB

DDR3

Memory Type

GDDR5

192bit

Memory Bus

192bit

38.40GB/s

Bandwidth

91.87GB/s

Render Config

-

3

SM Count

6

144

Shading Units

288

24

TMUs

48

24

ROPs

24

-

64 KB (per SM)

L1 Cache

64 KB (per SM)

384 KB

L2 Cache

384 KB

-

Theoretical Performance

4.320 GPixel/s

Pixel Rate

9.312 GPixel/s

17.28 GTexel/s

Texture Rate

37.25 GTexel/s

-

414.7 GFLOPS

FP32 (float)

894.0 GFLOPS

34.56 GFLOPS

FP64 (double)

74.50 GFLOPS

Board Design

75W

TDP

102W

250 W

Suggested PSU

300 W

2x DVI 1x mini-HDMI 1.3a

Outputs

2x DVI 1x mini-HDMI 1.3a

None

Power Connectors

-

Graphics Processor

GF116

GPU Name

GF114

GF116-150-A1

GPU Variant

-

Fermi 2.0

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

40 nm

1.17 billion

Transistors

1.95 billion

238 mm²

Die Size

332 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

1.1

OpenCL

1.1

N/A

Vulkan

N/A

2.1

CUDA

2.1

5.1

Shader Model

5.1

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