Review AMD Radeon HD 6870 CrossfireX: More Performance for Less

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November 12, 2010

In our first article on the HD 6870, our discussions revolved around its performance in games. The card did very good in some titles, while in some others, such as Metro 2033, we’re still not quite satisfied by the amount of frames per second produced by this card. It would, therefore, be really nice if we could multiply its processing power.

One logical way to improve performance significantly is by adding another HD 6870 and run the pair in multi-graphics configuration, which is relatively easy to do since the card has native CrossfireX support. How much additional performance can you expect from this multi-card setup anyway? We’ll get to that, but first, let’s examine the technical specs first.

Specification

AMD Radeon HD 6870AMD Radeon HD 6850
CodenameBarts XTBarts Pro
Fabrication Process40 nm40 nm
Transistors1.7 Billion1.7 Billion
Die Size225 mm2225 mm2
Core Clock900 MHz775 MHz
Stream Processors1120960
Texture Units5648
ROPs3232
Memory TypeGDDR5GDDR5
Memory Size1024 MB1024 MB
Memory Clock (effective)4200 MHz4000 MHz
Memory Interface256-bit256-bit
DirectX Version1111
Shader Model55
Power Connectors2x 6-pin6-pin
Min Recommended Power Supply500 Watt500 Watt
Bus SupportPCIe 2.1 x16PCIe 2.1 x16

CrossfireX Setup

amd hd 6870 cf card

You need at least two Radeon cards for CrossfireX setup. While not required, it would be better if both cards are identical. You will also need a motherboard with two PCIe x16 slots. Crossfire support is available on Intel motherboards based on the series 5 and 4 chipset families. It is also supported by motherboards based on more recent AMD chipsets (series 8 and 7).

amd hd 6870 cf bridge amd hd 6870 cf connector

Connect the two Radeons using a CrossfireX Bridge placed on top of the cards.

amd hd 6870 cf power

You will also need at least a 600 Watt power supply with four, 6-pin PCIe connectors.

When both cards have been properly positioned in their slots, it’s time to install the driver software. CrossfireX will be detected and activated automatically.

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