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ATI Mobility Radeon HD 3870 X2

ATI Mobility Radeon HD 3870 X2 Image
The Mobility Radeon HD 3870 X2 was a graphics card by ATI, launched in September 2008. Built on the 55 nm process, and based on the M88 graphics processor, the card supports DirectX 10.1. The M88 graphics processor is an average sized chip with a die area of 192 mm² and 666 million transistors. Mobility Radeon HD 3870 X2 combines two graphics processors to increase performance. It features 320 shading units, 16 texture mapping units and 16 ROPs per GPU. ATI has placed 1,024 MB GDDR3 memory on the card, which are connected using a 256-bit memory interface per GPU (each GPU manages 512 MB). The GPU is operating at a frequency of 660 MHz, memory is running at 850 MHz.
We recommend the ATI Mobility Radeon HD 3870 X2 for gaming with highest details at resolutions up to, and including, 1680x1050.
Its power draw is rated at 110 W maximum. Mobility Radeon HD 3870 X2 is connected to the rest of the system using a PCIe 2.0 x16 interface.

Graphics Processor

GPU Name: M88
Architecture: TeraScale 2
Process Size: 55 nm
Transistors: 666 million
Die Size: 192 mm²

Graphics Card

Released: Sep 1st, 2008
Production Status: End-of-life
Bus Interface: PCIe 2.0 x16

Clock Speeds

GPU Clock: 660 MHz
Memory Clock: 850 MHz
1700 MHz effective


Memory Size: 512 MB x2
Memory Type: GDDR3
Memory Bus: 256 bit x2
Bandwidth: 54.4 GB/s x2

Render Config

Shading Units: 320 x2
TMUs: 16 x2
ROPs: 16 x2
Compute Units: 4 x2
Pixel Rate: 10.56 GPixel/s x2
Texture Rate: 10.56 GTexel/s x2
Floating-point performance: 422.4 GFLOPS x2

Board Design

TDP: 110 W

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 3870 X2.

M88 GPU Notes