ATI Mobility Radeon HD 3870 vs ATI Mobility Radeon HD 4850

VS

ATI Mobility Radeon HD 3870

ATI Mobility Radeon HD 4850

We compared two Mobile platform GPUs: 512MB VRAM Mobility Radeon HD 3870 and 1024MB VRAM Mobility Radeon HD 4850 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Mobility Radeon HD 4850 's Advantages

Released 7 months late

More VRAM (1024GB vs 512GB)

480 additional rendering cores

Score

Benchmark

FP32 (float)

Mobility Radeon HD 3870

0.422 TFLOPS

Mobility Radeon HD 4850 +90%

0.804 TFLOPS

Mobility Radeon HD 3870

VS

Mobility Radeon HD 4850

Graphics Card

Jun 2008

Release Date

Jan 2009

M8x

Generation

M9x

Mobile

Type

Mobile

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

850 MHz

Memory Clock

850 MHz

Memory

512MB

Memory Size

1024MB

GDDR3

Memory Type

GDDR3

256bit

Memory Bus

256bit

54.40GB/s

Bandwidth

54.40GB/s

Render Config

4

Compute Units

10

-

320

Shading Units

800

16

TMUs

40

16

ROPs

16

-

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

10.56 GPixel/s

Pixel Rate

8.048 GPixel/s

10.56 GTexel/s

Texture Rate

20.12 GTexel/s

-

422.4 GFLOPS

FP32 (float)

804.8 GFLOPS

84.48 GFLOPS

FP64 (double)

161.0 GFLOPS

Board Design

55W

TDP

Unknown

-

No outputs

Outputs

Portable Device Dependent

-

Graphics Processor

M88

GPU Name

M98

-

GPU Variant

M98 L2 (216-0732019)

TeraScale

Architecture

TeraScale

TSMC

Foundry

TSMC

55 nm

Process Size

55 nm

0.666 billion

Transistors

0.956 billion

192 mm²

Die Size

256 mm²

Graphics Features

10.1 (10_1)

DirectX

10.1 (10_1)

3.3

OpenGL

3.3

N/A

OpenCL

1.1

N/A

Vulkan

N/A

-

4.1

Shader Model

4.1

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