ATI Radeon HD 3870 Mac Edition vs NVIDIA GeForce GTX 645 OEM

VS

ATI Radeon HD 3870 Mac Edition

NVIDIA GeForce GTX 645 OEM

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 3870 Mac Edition and 1024MB VRAM GeForce GTX 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 3870 Mac Edition 's Advantages

Larger VRAM bandwidth (72.06GB/s vs 64.00GB/s)

NVIDIA GeForce GTX 645 OEM 's Advantages

Released 4 years and 10 months late

More VRAM (1024GB vs 512GB)

256 additional rendering cores

Lower TDP (65W vs 106W)

Score

Benchmark

FP32 (float)

Radeon HD 3870 Mac Edition

0.497 TFLOPS

GeForce GTX 645 OEM +90%

0.949 TFLOPS

Radeon HD 3870 Mac Edition

VS

GeForce GTX 645 OEM

Graphics Card

Jun 2008

Release Date

Apr 2013

Radeon R600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1126 MHz

Memory Clock

1000 MHz

Memory

512MB

Memory Size

1024MB

GDDR4

Memory Type

GDDR5

256bit

Memory Bus

128bit

72.06GB/s

Bandwidth

64.00GB/s

Render Config

4

Compute Units

-

320

Shading Units

576

16

TMUs

48

16

ROPs

16

-

L1 Cache

16 KB (per SMX)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

12.43 GPixel/s

Pixel Rate

9.888 GPixel/s

12.43 GTexel/s

Texture Rate

39.55 GTexel/s

-

497.3 GFLOPS

FP32 (float)

949.2 GFLOPS

99.46 GFLOPS

FP64 (double)

39.55 GFLOPS

Board Design

106W

TDP

65W

300 W

Suggested PSU

250 W

2x DVI 1x S-Video

Outputs

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

1x 6-pin

Power Connectors

None

Graphics Processor

RV670

GPU Name

GK106

RV670 XT (215-0708005)

GPU Variant

GK106-200-A1

TeraScale

Architecture

Kepler

TSMC

Foundry

TSMC

55 nm

Process Size

28 nm

0.666 billion

Transistors

2.54 billion

192 mm²

Die Size

221 mm²

Graphics Features

10.1 (10_1)

DirectX

12 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.6

N/A

OpenCL

3.0

N/A

Vulkan

1.1

-

CUDA

3.0

4.1

Shader Model

5.1

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