NVIDIA GeForce GT 645 OEM vs ATI Radeon HD 3870

VS

NVIDIA GeForce GT 645 OEM

ATI Radeon HD 3870

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

Main Differences

NVIDIA GeForce GT 645 OEM 's Advantages

Released 4 years and 5 months late

More VRAM (1024GB vs 512GB)

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

Lower TDP (102W vs 106W)

ATI Radeon HD 3870 's Advantages

32 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM +79%

0.894 TFLOPS

Radeon HD 3870

0.497 TFLOPS

GeForce GT 645 OEM

VS

Radeon HD 3870

Graphics Card

Apr 2012

Release Date

Nov 2007

GeForce 600

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

957 MHz

Memory Clock

1126 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR4

192bit

Memory Bus

256bit

91.87GB/s

Bandwidth

72.06GB/s

Render Config

-

Compute Units

4

6

SM Count

-

288

Shading Units

320

48

TMUs

16

24

ROPs

16

-

64 KB (per SM)

L1 Cache

-

384 KB

L2 Cache

256 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

12.43 GPixel/s

37.25 GTexel/s

Texture Rate

12.43 GTexel/s

-

894.0 GFLOPS

FP32 (float)

497.3 GFLOPS

74.50 GFLOPS

FP64 (double)

99.46 GFLOPS

Board Design

102W

TDP

106W

300 W

Suggested PSU

300 W

2x DVI 1x mini-HDMI 1.3a

Outputs

2x DVI 1x S-Video

-

Power Connectors

1x 6-pin

Graphics Processor

GF114

GPU Name

RV670

-

GPU Variant

RV670 XT (215-0708005)

Fermi 2.0

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

1.95 billion

Transistors

0.666 billion

332 mm²

Die Size

192 mm²

Graphics Features

12 (11_0)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3 (full) 4.0 (partial)

1.1

OpenCL

N/A

Vulkan

N/A

2.1

CUDA

-

5.1

Shader Model

4.1

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