NVIDIA GeForce GT 640 vs AMD Radeon HD 6770 Green Edition

VS

NVIDIA GeForce GT 640

AMD Radeon HD 6770 Green Edition

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 2GB VRAM Radeon HD 6770 Green Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Larger VRAM bandwidth (28.51GB/s vs 21.34GB/s)

Lower TDP (65W vs 86W)

AMD Radeon HD 6770 Green Edition 's Advantages

Released 10 months late

336 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

Radeon HD 6770 Green Edition +45%

1.008 TFLOPS

GeForce GT 640

VS

Radeon HD 6770 Green Edition

Graphics Card

Jun 2012

Release Date

Apr 2013

GeForce 600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

891 MHz

Memory Clock

667 MHz

Memory

2GB

Memory Size

2GB

DDR3

Memory Type

GDDR3

128bit

Memory Bus

128bit

28.51GB/s

Bandwidth

21.34GB/s

Render Config

-

Compute Units

9

-

384

Shading Units

720

32

TMUs

36

16

ROPs

16

-

16 KB (per SMX)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

11.20 GPixel/s

28.86 GTexel/s

Texture Rate

25.20 GTexel/s

-

692.7 GFLOPS

FP32 (float)

1008 GFLOPS

28.86 GFLOPS

FP64 (double)

-

Board Design

65W

TDP

86W

250 W

Suggested PSU

250 W

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

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

None

Power Connectors

-

Graphics Processor

GK107

GPU Name

Juniper

GK107-300-A2

GPU Variant

Juniper LE (215-0754009)

Kepler

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

1.27 billion

Transistors

1.04 billion

118 mm²

Die Size

166 mm²

Graphics Features

12 (11_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

3.0

OpenCL

1.2

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

5.0

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