NVIDIA GeForce GT 640 vs ATI Radeon HD 3870 Mac Edition

VS

NVIDIA GeForce GT 640

ATI Radeon HD 3870 Mac Edition

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 512MB VRAM Radeon HD 3870 Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Released 4 years late

More VRAM (2GB vs 512GB)

64 additional rendering cores

Lower TDP (65W vs 106W)

ATI Radeon HD 3870 Mac Edition 's Advantages

Larger VRAM bandwidth (72.06GB/s vs 28.51GB/s)

Score

Benchmark

FP32 (float)

GeForce GT 640 +39%

0.693 TFLOPS

Radeon HD 3870 Mac Edition

0.497 TFLOPS

GeForce GT 640

VS

Radeon HD 3870 Mac Edition

Graphics Card

Jun 2012

Release Date

Jun 2008

GeForce 600

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

891 MHz

Memory Clock

1126 MHz

Memory

2GB

Memory Size

512MB

DDR3

Memory Type

GDDR4

128bit

Memory Bus

256bit

28.51GB/s

Bandwidth

72.06GB/s

Render Config

-

Compute Units

4

-

384

Shading Units

320

32

TMUs

16

ROPs

16

-

16 KB (per SMX)

L1 Cache

-

256 KB

L2 Cache

256 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

12.43 GPixel/s

28.86 GTexel/s

Texture Rate

12.43 GTexel/s

-

692.7 GFLOPS

FP32 (float)

497.3 GFLOPS

28.86 GFLOPS

FP64 (double)

99.46 GFLOPS

Board Design

65W

TDP

106W

250 W

Suggested PSU

300 W

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

Outputs

2x DVI 1x S-Video

None

Power Connectors

1x 6-pin

Graphics Processor

GK107

GPU Name

RV670

GK107-300-A2

GPU Variant

RV670 XT (215-0708005)

Kepler

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

1.27 billion

Transistors

0.666 billion

118 mm²

Die Size

192 mm²

Graphics Features

12 (11_0)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3 (full) 4.0 (partial)

3.0

OpenCL

N/A

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

4.1

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