NVIDIA GeForce GTX 645 OEM vs ATI Radeon HD 4855

VS

NVIDIA GeForce GTX 645 OEM

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GTX 645 OEM and 512MB VRAM Radeon HD 4855 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 3 years and 3 months late

More VRAM (1024GB vs 512GB)

Lower TDP (65W vs 110W)

ATI Radeon HD 4855 's Advantages

Larger VRAM bandwidth (115.2GB/s vs 64.00GB/s)

64 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GTX 645 OEM +28%

0.949 TFLOPS

Radeon HD 4855

0.736 TFLOPS

GeForce GTX 645 OEM

VS

Radeon HD 4855

Graphics Card

Apr 2013

Release Date

Jan 2010

GeForce 600

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1000 MHz

Memory Clock

900 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

256bit

64.00GB/s

Bandwidth

115.2GB/s

Render Config

-

Compute Units

8

-

576

Shading Units

640

48

TMUs

32

16

ROPs

16

-

16 KB (per SMX)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

9.888 GPixel/s

Pixel Rate

9.200 GPixel/s

39.55 GTexel/s

Texture Rate

18.40 GTexel/s

-

949.2 GFLOPS

FP32 (float)

736.0 GFLOPS

39.55 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

65W

TDP

110W

250 W

Suggested PSU

300 W

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

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

None

Power Connectors

1x 6-pin

Graphics Processor

GK106

GPU Name

RV770

GK106-200-A1

GPU Variant

RV770 PRO (215-0669065)

Kepler

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

2.54 billion

Transistors

0.956 billion

221 mm²

Die Size

256 mm²

Graphics Features

12 (11_0)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

3.0

OpenCL

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

4.1

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