ATI Radeon HD 2600 XT Mac Edition vs ATI Radeon HD 4855

VS

ATI Radeon HD 2600 XT Mac Edition

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 256MB VRAM Radeon HD 2600 XT Mac Edition and 512MB VRAM Radeon HD 4855 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 2600 XT Mac Edition 's Advantages

Lower TDP (45W vs 110W)

ATI Radeon HD 4855 's Advantages

Released 1 years and 11 months late

More VRAM (512GB vs 256GB)

Larger VRAM bandwidth (115.2GB/s vs 25.60GB/s)

520 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 2600 XT Mac Edition

0.168 TFLOPS

Radeon HD 4855 +338%

0.736 TFLOPS

Radeon HD 2600 XT Mac Edition

VS

Radeon HD 4855

Graphics Card

Feb 2008

Release Date

Jan 2010

Radeon R600

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

800 MHz

Memory Clock

900 MHz

Memory

256MB

Memory Size

512MB

GDDR3

Memory Type

GDDR5

128bit

Memory Bus

256bit

25.60GB/s

Bandwidth

115.2GB/s

Render Config

3

Compute Units

8

-

120

Shading Units

640

8

TMUs

32

4

ROPs

16

-

L1 Cache

16 KB (per CU)

64 KB

L2 Cache

256 KB

-

Theoretical Performance

2.800 GPixel/s

Pixel Rate

9.200 GPixel/s

5.600 GTexel/s

Texture Rate

18.40 GTexel/s

-

168.0 GFLOPS

FP32 (float)

736.0 GFLOPS

-

FP64 (double)

147.2 GFLOPS

Board Design

45W

TDP

110W

200 W

Suggested PSU

300 W

2x DVI

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

None

Power Connectors

1x 6-pin

Graphics Processor

RV630

GPU Name

RV770

-

GPU Variant

RV770 PRO (215-0669065)

TeraScale

Architecture

TeraScale

TSMC

Foundry

TSMC

65 nm

Process Size

55 nm

0.39 billion

Transistors

0.956 billion

153 mm²

Die Size

256 mm²

Graphics Features

10.0 (10_0)

DirectX

10.1 (10_1)

3.3

OpenGL

3.3

N/A

OpenCL

1.1

N/A

Vulkan

N/A

-

4.0

Shader Model

4.1

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