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ATI Mobility Radeon HD 4870

ATI Mobility Radeon HD 4870 Image
The Mobility Radeon HD 4870 was a graphics card by ATI, launched in January 2009. Built on the 55 nm process, and based on the M98 graphics processor, in its M98 XT variant, the card supports DirectX 10.1. The M98 graphics processor is an average sized chip with a die area of 256 mm² and 956 million transistors. It features 800 shading units, 40 texture mapping units and 16 ROPs. ATI has placed 512 MB GDDR3 memory on the card, which are connected using a 256-bit memory interface. The GPU is operating at a frequency of 550 MHz, memory is running at 888 MHz.
We recommend the ATI Mobility Radeon HD 4870 for gaming with highest details at resolutions up to, and including, 1280x720.
Its power draw is not exactly known. Mobility Radeon HD 4870 is connected to the rest of the system using a PCIe 2.0 x16 interface.

Graphics Processor

GPU Name: M98
GPU Variant: M98 XT
Architecture: TeraScale 2
Process Size: 55 nm
Transistors: 956 million
Die Size: 256 mm²

Graphics Card

Released: Jan 9th, 2009
Production Status: End-of-life
Bus Interface: PCIe 2.0 x16

Clock Speeds

GPU Clock: 550 MHz
Memory Clock: 888 MHz
1776 MHz effective


Memory Size: 512 MB
Memory Type: GDDR3
Memory Bus: 256 bit
Bandwidth: 56.8 GB/s

Render Config

Shading Units: 800
TMUs: 40
ROPs: 16
Compute Units: 10
Pixel Rate: 8.80 GPixel/s
Texture Rate: 22.00 GTexel/s
Floating-point performance: 880.0 GFLOPS

Graphics Features

DirectX: 10.1
OpenGL: 3.3
OpenCL: n/a
Shader Model: 4.1


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Our review database contains 2 reviews of the Mobility Radeon HD 4870.

M98 GPU Notes


Retail boards based on this design

Name GPU Clock Memory Clock Other Changes
ATi Mobility Radeon HD 4870 1 GB 550 MHz 700 MHz 1024 MB, GDDR5