GeForce GTX 780 vs GeForce GT 640

VS

NVIDIA GeForce GTX 780

NVIDIA GeForce GT 640

We compared two Desktop platform GPUs: 3GB VRAM GeForce GTX 780 and 2GB VRAM GeForce GT 640 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

GeForce GTX 780 's Advantages

Released 11 months late

Boost Clock902MHz

More VRAM (3GB vs 2GB)

Larger VRAM bandwidth (288.4GB/s vs 28.51GB/s)

1920 additional rendering cores

GeForce GT 640 's Advantages

Lower TDP (65W vs 250W)

Score

Benchmark

FP32 (float)

GeForce GTX 780 +499%

4156

GeForce GT 640

693

Blender

GeForce GTX 780 +428%

169

GeForce GT 640

32

OctaneBench

GeForce GTX 780 +1000%

88

GeForce GT 640

8

GeForce GTX 780

VS

GeForce GT 640

Graphics Card

May 2013

Release Date

Jun 2012

GeForce 700

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

863 MHz

Base Clock

-

902 MHz

Boost Clock

-

1502 MHz

Memory Clock

891 MHz

Memory

3GB

Memory Size

2GB

GDDR5

Memory Type

DDR3

384bit

Memory Bus

128bit

288.4GB/s

Bandwidth

28.51GB/s

Render Config

2304

Shading Units

384

192

TMUs

32

48

ROPs

16

16 KB (per SMX)

L1 Cache

16 KB (per SMX)

1536 KB

L2 Cache

256 KB

Theoretical Performance

43.30 GPixel/s

Pixel Rate

7.216 GPixel/s

173.2 GTexel/s

Texture Rate

28.86 GTexel/s

4.156 TFLOPS

FP32 (float)

692.7 GFLOPS

173.2 GFLOPS

FP64 (double)

28.86 GFLOPS

Board Design

250W

TDP

65W

600 W

Suggested PSU

250 W

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

1x 6-pin + 1x 8-pin

Power Connectors

None

Graphics Processor

GK110

GPU Name

GK107

GK110-300-A1

GPU Variant

GK107-300-A2

Kepler

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

7.08 billion

Transistors

1.27 billion

561 mm²

Die Size

118 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

3.0

OpenCL

3.0

1.1

Vulkan

1.1

3.5

CUDA

3.0

5.1

Shader Model

5.1

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