NVIDIA GeForce GTX 645 OEM vs ATI Radeon HD 3870 X2

VS

NVIDIA GeForce GTX 645 OEM

ATI Radeon HD 3870 X2

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GTX 645 OEM and 512MB VRAM Radeon HD 3870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GTX 645 OEM 's Advantages

Released 5 years and 3 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (64.00GB/s vs 57.66GB/s)

256 additional rendering cores

Lower TDP (65W vs 165W)

Score

Benchmark

FP32 (float)

GeForce GTX 645 OEM +79%

0.949 TFLOPS

Radeon HD 3870 X2

0.528 TFLOPS

GeForce GTX 645 OEM

VS

Radeon HD 3870 X2

Graphics Card

Apr 2013

Release Date

Jan 2008

GeForce 600

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1000 MHz

Memory Clock

901 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

128bit

Memory Bus

256bit

64.00GB/s

Bandwidth

57.66GB/s

Render Config

-

Compute Units

4

-

576

Shading Units

320

48

TMUs

16

ROPs

16

-

16 KB (per SMX)

L1 Cache

-

256 KB

L2 Cache

256 KB

-

Theoretical Performance

9.888 GPixel/s

Pixel Rate

13.20 GPixel/s

39.55 GTexel/s

Texture Rate

13.20 GTexel/s

-

949.2 GFLOPS

FP32 (float)

528.0 GFLOPS

39.55 GFLOPS

FP64 (double)

105.6 GFLOPS

Board Design

65W

TDP

165W

250 W

Suggested PSU

450 W

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

Outputs

2x DVI 1x S-Video

None

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

GK106

GPU Name

R680

GK106-200-A1

GPU Variant

R680 XT (215-0708017)

Kepler

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

2.54 billion

Transistors

0.666 billion

221 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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