NVIDIA GeForce GTX 275 vs ATI Radeon HD 4855

VS

NVIDIA GeForce GTX 275

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 896MB VRAM GeForce GTX 275 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 275 's Advantages

More VRAM (896GB vs 512GB)

Larger VRAM bandwidth (127.0GB/s vs 115.2GB/s)

ATI Radeon HD 4855 's Advantages

Released 1 years late

400 additional rendering cores

Lower TDP (110W vs 219W)

Score

Benchmark

FP32 (float)

GeForce GTX 275

0.674 TFLOPS

Radeon HD 4855 +9%

0.736 TFLOPS

GeForce GTX 275

VS

Radeon HD 4855

Graphics Card

Jan 2009

Release Date

Jan 2010

GeForce 200

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1134 MHz

Memory Clock

900 MHz

Memory

896MB

Memory Size

512MB

GDDR3

Memory Type

GDDR5

448bit

Memory Bus

256bit

127.0GB/s

Bandwidth

115.2GB/s

Render Config

-

Compute Units

8

30

SM Count

-

240

Shading Units

640

80

TMUs

32

28

ROPs

16

-

L1 Cache

16 KB (per CU)

224 KB

L2 Cache

256 KB

-

Theoretical Performance

17.72 GPixel/s

Pixel Rate

9.200 GPixel/s

50.64 GTexel/s

Texture Rate

18.40 GTexel/s

-

673.9 GFLOPS

FP32 (float)

736.0 GFLOPS

84.24 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

219W

TDP

110W

550 W

Suggested PSU

300 W

2x DVI

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

GT200B

GPU Name

RV770

G200-105-B3

GPU Variant

RV770 PRO (215-0669065)

Tesla 2.0

Architecture

TeraScale

TSMC

Foundry

TSMC

55 nm

Process Size

55 nm

1.4 billion

Transistors

0.956 billion

470 mm²

Die Size

256 mm²

Graphics Features

11.1 (10_0)

DirectX

10.1 (10_1)

3.3

OpenGL

3.3

1.1

OpenCL

1.1

N/A

Vulkan

N/A

1.3

CUDA

-

4.0

Shader Model

4.1

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