AMD Radeon R5 A255 vs AMD Radeon HD 6770M Mac Edition

VS

AMD Radeon R5 A255

AMD Radeon HD 6770M Mac Edition

We compared two Mobile platform GPUs: 1024MB VRAM Radeon R5 A255 and 512MB VRAM Radeon HD 6770M Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R5 A255 's Advantages

Released 3 years late

Boost Clock940MHz

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (64.00GB/s vs 57.60GB/s)

AMD Radeon HD 6770M Mac Edition 's Advantages

96 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R5 A255 +3%

0.721 TFLOPS

Radeon HD 6770M Mac Edition

0.696 TFLOPS

Radeon R5 A255

VS

Radeon HD 6770M Mac Edition

Graphics Card

Jan 2014

Release Date

Jan 2011

All-In-One

Generation

Vancouver

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

MXM-A (3.0)

Clock Speeds

925 MHz

Base Clock

-

940 MHz

Boost Clock

-

1000 MHz

Memory Clock

900 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

128bit

64.00GB/s

Bandwidth

57.60GB/s

Render Config

6

Compute Units

6

-

384

Shading Units

480

24

TMUs

24

8

ROPs

8

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

7.520 GPixel/s

Pixel Rate

5.800 GPixel/s

22.56 GTexel/s

Texture Rate

17.40 GTexel/s

-

721.9 GFLOPS

FP32 (float)

696.0 GFLOPS

-

Board Design

Unknown

TDP

35W

-

Portable Device Dependent

Outputs

No outputs

-

Graphics Processor

Topaz

GPU Name

Whistler

Topaz PRO (216-0858030)

GPU Variant

Whistler XT (216-0810001)

GCN 3.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

1.55 billion

Transistors

0.716 billion

125 mm²

Die Size

104 mm²

Graphics Features

12 (12_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

2.1

OpenCL

1.2

1.2.170

Vulkan

N/A

-

6.5

Shader Model

5.0

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