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

VS

ATI Radeon HD 3870 Mac Edition

NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 3870 Mac Edition and 1024MB VRAM GeForce GT 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

32 additional rendering cores

NVIDIA GeForce GT 645 OEM 's Advantages

Released 3 years and 10 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (91.87GB/s vs 72.06GB/s)

Lower TDP (102W vs 106W)

Score

Benchmark

FP32 (float)

Radeon HD 3870 Mac Edition

0.497 TFLOPS

GeForce GT 645 OEM +79%

0.894 TFLOPS

Radeon HD 3870 Mac Edition

VS

GeForce GT 645 OEM

Graphics Card

Jun 2008

Release Date

Apr 2012

Radeon R600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1126 MHz

Memory Clock

957 MHz

Memory

512MB

Memory Size

1024MB

GDDR4

Memory Type

GDDR5

256bit

Memory Bus

192bit

72.06GB/s

Bandwidth

91.87GB/s

Render Config

4

Compute Units

-

SM Count

6

320

Shading Units

288

16

TMUs

48

16

ROPs

24

-

L1 Cache

64 KB (per SM)

256 KB

L2 Cache

384 KB

-

Theoretical Performance

12.43 GPixel/s

Pixel Rate

9.312 GPixel/s

12.43 GTexel/s

Texture Rate

37.25 GTexel/s

-

497.3 GFLOPS

FP32 (float)

894.0 GFLOPS

99.46 GFLOPS

FP64 (double)

74.50 GFLOPS

Board Design

106W

TDP

102W

300 W

Suggested PSU

300 W

2x DVI 1x S-Video

Outputs

2x DVI 1x mini-HDMI 1.3a

1x 6-pin

Power Connectors

-

Graphics Processor

RV670

GPU Name

GF114

RV670 XT (215-0708005)

GPU Variant

-

TeraScale

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

55 nm

Process Size

40 nm

0.666 billion

Transistors

1.95 billion

192 mm²

Die Size

332 mm²

Graphics Features

10.1 (10_1)

DirectX

12 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.6

N/A

OpenCL

1.1

N/A

Vulkan

N/A

-

CUDA

2.1

4.1

Shader Model

5.1

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