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ATI Radeon HD 4870 X2

ATI Radeon HD 4870 X2 Image ATI R700 Image
The Radeon HD 4870 X2 was a high-end graphics card by ATI, launched in August 2008. Built on the 55 nm process, and based on the R700 graphics processor, in its R700 XT variant, the card supports DirectX 10.1. The R700 graphics processor is an average sized chip with a die area of 256 mm² and 956 million transistors. Radeon HD 4870 X2 combines two graphics processors to increase performance. It features 800 shading units, 40 texture mapping units and 16 ROPs per GPU. ATI has placed 2,048 MB GDDR5 memory on the card, which are connected using a 256-bit memory interface per GPU (each GPU manages 1,024 MB). The GPU is operating at a frequency of 700 MHz, memory is running at 900 MHz.
We recommend the ATI Radeon HD 4870 X2 for gaming with highest details at resolutions up to, and including, 1680x1050.
Being a dual-slot card, the ATI Radeon HD 4870 X2 draws power from 1x 6-pin + 1x 8-pin power connectors, with power draw rated at 286 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 4870 X2 is connected to the rest of the system using a PCIe 2.0 x16 interface. The card measures 267 mm in length, and features a dual-slot cooling solution. Its price at launch was 550 US Dollars.

Graphics Processor

GPU Name: R700
GPU Variant: R700 XT
Architecture: TeraScale
Process Size: 55 nm
Transistors: 956 million
Die Size: 256 mm²

Graphics Card

Released: Aug 12th, 2008
Production Status: End-of-life
Launch Price: 550 USD
Bus Interface: PCIe 2.0 x16

Clock Speeds

GPU Clock: 700 MHz
Memory Clock: 900 MHz
3600 MHz effective


Memory Size: 1024 MB x2
Memory Type: GDDR5
Memory Bus: 256 bit x2
Bandwidth: 115.2 GB/s x2

Render Config

Shading Units: 800 x2
TMUs: 40 x2
ROPs: 16 x2
Compute Units: 10 x2
Pixel Rate: 11.20 GPixel/s x2
Texture Rate: 28.00 GTexel/s x2
Floating-point performance: 1,120.0 GFLOPS x2

Board Design

Slot Width: Dual-slot
Length: 10.5 inches
267 mm
TDP: 286 W
Outputs: 2x DVI
1x S-Video
Power Connectors: 1x 6-pin + 1x 8-pin
Board Number: B509

Graphics Features

DirectX: 10.1
OpenGL: 3.3
OpenCL: 1.0
Shader Model: 4.1


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Our review database contains 79 reviews of the Radeon HD 4870 X2.

Card Notes

Also known as R700. This is a dual GPU card that features two RV770XT chips and a PCI-E lane arbiter chip made by PLX. The card features a total of 2 GB GDDR5 memory.

Retail boards based on this design

Name GPU Clock Memory Clock Other Changes
ASUS HD 4870 X2 TOP 790 MHz 915 MHz
Gainward Rampage700 GS 750 MHz 950 MHz Triple-slot, 1x DVI 1x VGA 1x HDMI 1x DisplayPort
Gainward Rampage700 GS GLH 790 MHz 950 MHz Triple-slot, 1x DVI 1x VGA 1x HDMI 1x DisplayPort
Sapphire HD 4870 X2 750 MHz 900 MHz
Sapphire HD 4870 X2 ATOMIC 800 MHz 1000 MHz Single-slot