AMD Radeon R5 A255 vs NVIDIA GeForce GT 640M LE

VS

AMD Radeon R5 A255

NVIDIA GeForce GT 640M LE

We compared two Mobile platform GPUs: 1024MB VRAM Radeon R5 A255 and 2GB VRAM GeForce GT 640M LE to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R5 A255 's Advantages

Released 1 years and 8 months late

Boost Clock940MHz

Larger VRAM bandwidth (64.00GB/s vs 50.24GB/s)

288 additional rendering cores

NVIDIA GeForce GT 640M LE 's Advantages

More VRAM (2GB vs 1024GB)

Score

Benchmark

FP32 (float)

Radeon R5 A255 +149%

0.721 TFLOPS

GeForce GT 640M LE

0.289 TFLOPS

Radeon R5 A255

VS

GeForce GT 640M LE

Graphics Card

Jan 2014

Release Date

May 2012

All-In-One

Generation

GeForce 600M

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

PCIe 2.0 x16

Clock Speeds

925 MHz

Base Clock

-

940 MHz

Boost Clock

-

1000 MHz

Memory Clock

785 MHz

Memory

1024MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

128bit

64.00GB/s

Bandwidth

50.24GB/s

Render Config

6

Compute Units

-

SM Count

2

384

Shading Units

96

24

TMUs

16

8

ROPs

4

-

16 KB (per CU)

L1 Cache

64 KB (per SM)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

7.520 GPixel/s

Pixel Rate

3.012 GPixel/s

22.56 GTexel/s

Texture Rate

12.05 GTexel/s

-

721.9 GFLOPS

FP32 (float)

289.0 GFLOPS

-

FP64 (double)

24.08 GFLOPS

Board Design

Unknown

TDP

32W

-

Portable Device Dependent

Outputs

No outputs

-

Graphics Processor

Topaz

GPU Name

GF108

Topaz PRO (216-0858030)

GPU Variant

-

GCN 3.0

Architecture

Fermi

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

1.55 billion

Transistors

0.585 billion

125 mm²

Die Size

116 mm²

Graphics Features

12 (12_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

2.1

OpenCL

1.1

1.2.170

Vulkan

N/A

-

CUDA

2.1

6.5

Shader Model

5.1

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